Advanced Science Tutorials | Scientific Models for Students: Physical, Conceptual, Mathematical and Computer Models

Scientific models for students are not just plastic replicas or neat diagrams. A scientific model is a simplified representation of an object, system, process or relationship that helps us describe, explain, predict or communicate something about the natural world. Models can be physical, visual, verbal, conceptual, mathematical or computational. Their power comes from what they make easier to see or reason about; their limitation is that every model leaves something out.

This Advanced Science Tutorials guide is written for parents and students in Sengkang, Punggol and across Singapore who search for scientific models, types of scientific models, model in Science, physical models, conceptual models, mathematical models, computer models, why scientists use models and limitations of models. It develops modelling from Primary Science through PSLE and into Secondary G1, G2 and G3 Science.

Cambridge International describes scientific models as ways to explain and think about objects and systems that may be abstract, invisible, too large or too small to observe directly, and explicitly teaches students to understand how models are useful and where they are limited. NSTA similarly emphasises models as tools for describing, explaining and predicting natural phenomena. See Cambridge International: Scientific Modelling, NSTA: Using Models to Teach Science, and RSC Education: How to Teach Scientific Models.

The model-reading routine

1. Represent: what real object, system or relationship is this model standing for?
2. Map: which parts of the model correspond to real features?
3. Purpose: what question is the model designed to answer?
4. Predict: what should happen if one condition changes?
5. Test: what evidence could support or challenge the model?
6. Limit: what has the model simplified, omitted or distorted?
7. Compare: would a different model be better for another question?
8. Revise: how should the model change when new evidence appears?

Primary 1 and Primary 2: model readiness

Young learners already use models when they draw a route, build a block structure, sort objects into groups or use arrows to show what happens next. The useful habit is recognising that the drawing or object stands for something else and does not contain every detail of reality.

Parents can ask, “What does this part represent?” and “What did you leave out?” Those two questions establish the foundations of scientific modelling without requiring advanced terminology.

Primary 3 and Primary 4: diagrams become explanatory tools

Primary students increasingly use life-cycle diagrams, light-ray sketches, material-property tables, simple systems and experimental setups. They should understand that diagram size, colour and spacing may be symbolic rather than literal. A labelled drawing can focus attention on one relationship by omitting everything else.

The existing Primary-focused page How Scientific Models Help Students Explain Things They Cannot See Directly remains the local-level owner. This article extends modelling across all Science branches and into Secondary.

Primary 5 and Primary 6: models should generate predictions

By Primary 5 and Primary 6, students should do more than label models. A good model should help them predict what happens if one component changes. In a circuit, a connection model predicts whether current can flow. In a food web, a relationship model helps trace population effects. In a heat-transfer model, arrows can predict direction of energy transfer.

PSLE-style questions often change surface details. Students who understand the model can transfer; students who memorised one picture may not.

Secondary G1, G2 and G3: modelling becomes explicit

Lower Secondary Science uses particle models, cell models, atomic and molecular models, ray models, force models, energy representations, graphs and equations. Students should learn that different models can represent the same system for different purposes. A particle diagram may explain state; an equation may quantify a relationship; a simulation may explore change over time.

The useful question is not “Which model is the true picture?” but “Which model is useful for this question, and what limitations must we remember?”

Physical scale model

What the model does. A physical scale model changes size while preserving selected proportions or relationships.

Common misunderstanding. Students may assume every classroom model is accurately scaled in every dimension.

Example. A planet-size model can preserve diameter ratios while a separate distance model handles orbital spacing.

Question to ask. Ask which dimensions are scaled and which are not.

Transfer task. Build or inspect two Solar System models and compare what each communicates.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Replica model

What the model does. A replica copies selected external features of an object.

Common misunderstanding. Students may think a replica automatically explains how the object works.

Example. An anatomical heart replica can show chambers without reproducing living tissue behaviour.

Question to ask. Ask whether the model shows structure, mechanism or both.

Transfer task. Compare a static replica with an animated flow model.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Cross-section model

What the model does. A cross-section reveals internal structure by cutting through or removing outer layers conceptually.

Common misunderstanding. Students may think internal parts are actually arranged as a flat slice.

Example. Earth-interior diagrams are cross-sectional representations of three-dimensional layers.

Question to ask. Ask what direction and plane the section represents.

Transfer task. Compare cross-sections taken at different orientations.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Exploded diagram

What the model does. An exploded model separates components so their relationships can be seen.

Common misunderstanding. Students may think the parts are normally physically separated by the displayed gaps.

Example. Machines and organs can be shown pulled apart for clarity.

Question to ask. Ask what connections are hidden by the separation.

Transfer task. Reassemble the conceptual system in the correct order.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Life-cycle model

What the model does. A life-cycle diagram represents developmental sequence and recurrence.

Common misunderstanding. Students may think the cycle must begin at the top or that every organism follows identical stages.

Example. Different insects can have different developmental stages while still forming life cycles.

Question to ask. Ask what changes between stages and which transitions are essential.

Transfer task. Redraw the cycle starting at a different stage.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Food-chain model

What the model does. A food-chain model simplifies one pathway of feeding relationships.

Common misunderstanding. Students may think an ecosystem has only one linear route.

Example. Real organisms usually participate in networks rather than single chains.

Question to ask. Ask what relationships are omitted.

Transfer task. Expand one chain into a food web.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Food-web model

What the model does. A food web represents multiple feeding relationships in an ecosystem.

Common misunderstanding. Students may read arrows in the wrong direction or assume it predicts one fixed outcome.

Example. Arrows represent a convention for transfer and indirect outcomes can vary.

Question to ask. Ask what each arrow means before tracing consequences.

Transfer task. Predict two plausible effects of changing one population.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Water-cycle model

What the model does. A water-cycle model represents stores and transfers among atmosphere, land, water bodies and living systems.

Common misunderstanding. Students may think every water molecule follows one circular route in the same order.

Example. Water can remain in oceans, ice or groundwater for very different periods.

Question to ask. Ask which reservoirs and pathways the diagram omits.

Transfer task. Convert the circle into a network model.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Rock-cycle model

What the model does. The rock cycle represents possible transformations among rock types.

Common misunderstanding. Students may think all rocks follow one mandatory sequence.

Example. Many pathways are possible depending on geological history.

Question to ask. Ask whether every arrow is reversible and under what process.

Transfer task. Trace three different routes from one rock type.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Particle model

What the model does. The particle model represents matter as tiny particles whose arrangement and motion help explain state and change.

Common misunderstanding. Students may draw particles as tiny visible chunks of the substance.

Example. Particle size, colour and spacing in diagrams are usually symbolic.

Question to ask. Ask what each dot stands for and whether spaces are to scale.

Transfer task. Use the model to predict compression or diffusion.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Solid particle model

What the model does. A solid model shows particles close together with fixed relative positions in a simple representation.

Common misunderstanding. Students may think particles stop moving completely.

Example. Particles can vibrate even when the solid keeps its macroscopic shape.

Question to ask. Ask what heating changes before melting.

Transfer task. Compare cold and warmer solid particle-motion representations.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Liquid particle model

What the model does. A liquid model shows particles close together but able to change neighbours.

Common misunderstanding. Students may think liquid particles are much farther apart than solid particles.

Example. Many liquids and solids have relatively similar particle spacing compared with gases.

Question to ask. Ask what explains flow if spacing changes only modestly.

Transfer task. Compare arrangement rather than exaggerating distance.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Gas particle model

What the model does. A gas model represents particles widely separated relative to their size and moving throughout the container.

Common misunderstanding. Students may draw gas only at the top of a container.

Example. Gas fills available volume under ordinary conditions.

Question to ask. Ask why particles are represented throughout the container.

Transfer task. Predict what compression changes.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Diffusion model

What the model does. A diffusion model explains net spreading through random particle motion.

Common misunderstanding. Students may think particles intentionally move from high to low concentration.

Example. Random motion creates a statistical net spread.

Question to ask. Ask whether individual particles can move in either direction.

Transfer task. Use a simple simulation to track many particles.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Atomic model

What the model does. Atomic models represent internal structure and have changed historically with evidence.

Common misunderstanding. Students may think the latest diagram is a literal photograph of an atom.

Example. Models from Dalton to nuclear and quantum descriptions serve different purposes.

Question to ask. Ask what evidence required model revision.

Transfer task. Compare two atomic models and identify what each explains.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Bohr-style atom model

What the model does. A Bohr-style model places electrons in simplified energy levels around a nucleus.

Common misunderstanding. Students may think electrons orbit like planets on fixed circular tracks.

Example. The model is useful for some patterns but not a literal trajectory picture.

Question to ask. Ask which chemical patterns it helps explain.

Transfer task. Compare with a more modern electron-cloud description at suitable level.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Ball-and-stick model

What the model does. Ball-and-stick models show bonded atoms and geometry.

Common misunderstanding. Students may think bond lengths, atom sizes and colours are literally represented.

Example. The sticks and colours are conventions to make structure visible.

Question to ask. Ask what information the model exaggerates.

Transfer task. Compare with space-filling models.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Space-filling molecular model

What the model does. Space-filling models emphasise relative occupied volume and molecular surface.

Common misunderstanding. Students may find bonds harder to see and assume they disappeared.

Example. Different representations highlight different features.

Question to ask. Ask which model is better for shape versus connectivity.

Transfer task. Choose a model for a stated question.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Ionic lattice model

What the model does. An ionic lattice model represents repeating charged particles in an extended structure.

Common misunderstanding. Students may treat ionic compounds as separate molecules like water.

Example. The extended lattice explains many properties better than a molecular picture.

Question to ask. Ask what repeating pattern is shown.

Transfer task. Relate structure to melting or conductivity at appropriate level.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Metallic model

What the model does. A metallic-bonding model represents positive ions with delocalised electrons.

Common misunderstanding. Students may picture metal atoms moving freely through the wire.

Example. The lattice remains largely fixed while electrons are mobile in the model.

Question to ask. Ask what feature explains conductivity.

Transfer task. Compare with an insulator model.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Cell model

What the model does. A cell model represents cellular structures and their relationships.

Common misunderstanding. Students may think textbook cell diagrams are drawn to scale or that every cell has the same shape.

Example. Actual cells differ greatly and organelle proportions vary.

Question to ask. Ask which features are universal and which are specialised.

Transfer task. Compare a diagram with a microscope image.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Organ model

What the model does. An organ model represents key structures while omitting surrounding tissues.

Common misunderstanding. Students may think omitted parts do not exist or do not matter.

Example. A digestive-system diagram intentionally excludes many organs outside the focus.

Question to ask. Ask what the model leaves out to reduce complexity.

Transfer task. Add one omitted interaction to the model.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Body-system model

What the model does. A body-system model groups organs by functional relationships.

Common misunderstanding. Students may treat systems as isolated chapters.

Example. Circulatory, respiratory and digestive systems interact continuously.

Question to ask. Ask what moves between systems.

Transfer task. Draw a cross-system transport model.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Photosynthesis model

What the model does. A photosynthesis model represents inputs, energy transformation and products.

Common misunderstanding. Students may reduce it to a memorised equation without cellular context.

Example. Different models show gas exchange, chloroplast process or energy conversion.

Question to ask. Ask what scale the model operates at.

Transfer task. Translate between word equation and system diagram.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Respiration model

What the model does. A respiration model represents chemical release of usable energy from food.

Common misunderstanding. Students may equate respiration with breathing.

Example. Breathing is organism-level gas movement; respiration is cellular chemistry.

Question to ask. Ask what scale each process belongs to.

Transfer task. Connect lungs, circulation and cells in one model.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Genetic model

What the model does. Genetic models represent inheritance relationships, DNA information or allele transmission.

Common misunderstanding. Students may think one gene determines most complex traits completely.

Example. Many traits involve multiple genes and environment.

Question to ask. Ask which assumptions a simple Punnett square makes.

Transfer task. Compare single-gene and polygenic situations conceptually.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Evolutionary tree

What the model does. A phylogenetic tree models common ancestry and branching relationships.

Common misunderstanding. Students may read the tree as a ladder of progress.

Example. Modern species occur at tips and share ancestors rather than one current species turning into another.

Question to ask. Ask which pair shares the most recent common ancestor.

Transfer task. Rotate branches and check whether relationships change.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Population model

What the model does. Population models track births, deaths, migration or resource limits.

Common misunderstanding. Students may think a smooth curve predicts exact individual counts.

Example. Models simplify complex environments and parameter variation.

Question to ask. Ask which assumptions generate the curve.

Transfer task. Change one parameter and inspect sensitivity.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Ecosystem box model

What the model does. A box-and-arrow ecosystem model tracks matter or energy among compartments.

Common misunderstanding. Students may assume arrows mean physical pipes.

Example. Arrows represent flows or relationships.

Question to ask. Ask what quantity each arrow carries.

Transfer task. Add missing stores and feedbacks.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Force-arrow model

What the model does. Force diagrams represent forces acting on an object using arrows.

Common misunderstanding. Students may draw arrows for motion rather than force.

Example. Arrows should represent interactions and direction, often with length indicating magnitude qualitatively.

Question to ask. Ask which object exerts each force.

Transfer task. Remove arrows that do not represent interactions.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Free-body diagram

What the model does. A free-body diagram isolates one object and the external forces acting on it.

Common misunderstanding. Students may include forces the object exerts on others.

Example. The model deliberately focuses on forces acting on the chosen object.

Question to ask. Ask ‘force on what, by what?’ for each arrow.

Transfer task. Compare two-object systems with separate diagrams.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Motion graph

What the model does. Position-time or velocity-time graphs model how motion changes over time.

Common misunderstanding. Students may treat the graph as a literal picture of the path.

Example. Graph slope and area can carry physical meaning depending on axes.

Question to ask. Ask what each axis represents.

Transfer task. Describe motion without drawing a route picture.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Energy-flow model

What the model does. Energy diagrams track transfers or transformations through a system.

Common misunderstanding. Students may treat energy as a visible fluid substance.

Example. Arrows represent accounting relationships rather than literal streams.

Question to ask. Ask what system boundary is used.

Transfer task. Trace input, useful output and dissipated pathways.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Ray model of light

What the model does. Ray diagrams represent direction of light propagation.

Common misunderstanding. Students may think rays are physical lines in space.

Example. Rays are geometric representations useful for reflection and imaging.

Question to ask. Ask what wave properties the ray model omits.

Transfer task. Choose ray versus wave model for a question.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Wave model

What the model does. Wave models represent propagation using quantities such as wavelength, frequency and amplitude.

Common misunderstanding. Students may think the drawn wave is the path a particle travels.

Example. For many waves, medium particles oscillate while the disturbance propagates.

Question to ask. Ask what direction energy travels versus particle motion.

Transfer task. Compare transverse drawings with actual medium behaviour.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Circuit model

What the model does. Circuit diagrams represent components and electrical connections symbolically.

Common misunderstanding. Students may rely on spatial layout instead of topology.

Example. Two differently drawn diagrams can represent the same circuit.

Question to ask. Ask which nodes are electrically connected.

Transfer task. Redraw the circuit without changing connectivity.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Current model

What the model does. A current model represents charge flow rate through a circuit.

Common misunderstanding. Students may think current is used up by components.

Example. In simple steady circuits, current relationships depend on connection topology.

Question to ask. Ask where charge accumulates or continues.

Transfer task. Compare series and parallel pathways.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Potential-difference model

What the model does. Voltage models represent energy transfer per unit charge or potential difference between points.

Common misunderstanding. Students may picture voltage as a substance flowing.

Example. Voltage is associated with relationships between points, not a material flow.

Question to ask. Ask which two points the measurement refers to.

Transfer task. Compare voltmeter placements.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Magnetic-field model

What the model does. Field lines represent direction and relative strength of magnetic effects.

Common misunderstanding. Students may think field lines are physical strings.

Example. Field-line density is representational, not literal material density.

Question to ask. Ask what a compass would do at different points.

Transfer task. Predict interaction without touching the magnet.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Gravitational-field model

What the model does. A gravitational field model represents how masses influence other masses through space.

Common misunderstanding. Students may think gravity only exists near surfaces.

Example. Field strength changes with position but does not abruptly vanish.

Question to ask. Ask what happens to field with distance.

Transfer task. Use orbits as evidence of continuing gravity.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Solar-system model

What the model does. A Solar System model represents orbital relationships, sizes or distances.

Common misunderstanding. Students may assume one model preserves both size and spacing accurately.

Example. Classroom models usually compromise because real scale differences are enormous.

Question to ask. Ask whether size and distance use the same scale.

Transfer task. Build separate size and distance models.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Moon-phase model

What the model does. A Sun–Earth–Moon model represents changing illumination geometry.

Common misunderstanding. Students may think phase diagrams show Earth’s shadow.

Example. The model shows the Moon is always half illuminated by the Sun except during eclipse geometry.

Question to ask. Ask what an observer on Earth sees.

Transfer task. Move the observer viewpoint explicitly.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Season model

What the model does. A tilted-Earth model represents changes in sunlight angle and day length.

Common misunderstanding. Students may attribute seasons mainly to distance.

Example. Opposite hemispheric seasons support the tilt explanation.

Question to ask. Ask what changes at solstices and equinoxes.

Transfer task. Compare sunlight geometry.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Weather model

What the model does. Numerical weather models use equations and observations to simulate atmospheric evolution.

Common misunderstanding. Students may think model output is a direct measurement.

Example. Forecasts depend on initial conditions, model physics and resolution.

Question to ask. Ask which observations initialise the model.

Transfer task. Compare forecasts from different model runs.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Climate model

What the model does. Climate models simulate long-term interactions among atmosphere, oceans, land, ice and other components.

Common misunderstanding. Students may think they are merely extended weather forecasts.

Example. Climate projections focus on statistical behaviour under scenarios.

Question to ask. Ask which boundary conditions and emissions scenarios differ.

Transfer task. Compare ensembles rather than one run.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Earth-interior model

What the model does. Earth-layer models represent crust, mantle, core and physical states.

Common misunderstanding. Students may picture mantle as a global ocean of magma.

Example. Seismic evidence indicates mostly solid mantle capable of slow deformation.

Question to ask. Ask what evidence can probe inaccessible depths.

Transfer task. Compare compositional and mechanical layer models.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Plate-tectonic model

What the model does. Plate models represent lithospheric motion and boundary interactions.

Common misunderstanding. Students may think every earthquake or volcano fits one identical boundary process.

Example. Different boundary and intraplate settings create different phenomena.

Question to ask. Ask which observations a plate model predicts.

Transfer task. Map earthquakes and volcanoes against plate boundaries.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Water-table model

What the model does. Groundwater models represent saturated zones, pores and flow through geological materials.

Common misunderstanding. Students may imagine one underground lake.

Example. Porous and fractured media are often more realistic.

Question to ask. Ask how permeability affects flow.

Transfer task. Compare sand, clay and fractured rock conceptually.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Weathering model

What the model does. Weathering models represent breakdown of material by physical, chemical or biological processes.

Common misunderstanding. Students may confuse weathering with transport.

Example. Erosion moves weathered material.

Question to ask. Ask where breakdown happens and where material moves.

Transfer task. Separate process arrows in a landscape model.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Mathematical equation

What the model does. An equation can be a scientific model connecting quantities.

Common misunderstanding. Students may treat formulas as calculation recipes with no assumptions.

Example. Equations apply under specified conditions and definitions.

Question to ask. Ask what each symbol means and what assumptions underlie the relationship.

Transfer task. Predict qualitative changes before substituting numbers.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Linear model

What the model does. A linear model represents constant-rate or proportional relationships over a defined range.

Common misunderstanding. Students may extend a straight line beyond all data.

Example. Many relationships become nonlinear outside a limited range.

Question to ask. Ask what evidence supports linearity.

Transfer task. Compare interpolation and extrapolation.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Proportional model

What the model does. A proportional model has a constant ratio and passes through the relevant origin under its assumptions.

Common misunderstanding. Students may call every straight line proportional.

Example. A straight line with nonzero intercept is not direct proportionality.

Question to ask. Ask whether doubling one variable doubles the other.

Transfer task. Check the intercept and ratio.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Exponential model

What the model does. Exponential models represent growth or decay proportional to current amount.

Common misunderstanding. Students may think exponential means simply fast.

Example. Early exponential change can look modest before accelerating.

Question to ask. Ask what stays constant: difference or ratio.

Transfer task. Compare linear and exponential sequences.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Logarithmic scale model

What the model does. Logarithmic scales compress multiplicative ranges.

Common misunderstanding. Students may read equal visual intervals as equal additive differences.

Example. pH, sound level and earthquake measures use logarithmic ideas in different ways.

Question to ask. Ask what one scale step means numerically.

Transfer task. Translate selected values into ratios at suitable level.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Probability model

What the model does. Probability models represent uncertainty across possible outcomes.

Common misunderstanding. Students may treat 70% probability as a guarantee or as failure if the 30% event occurs.

Example. Probabilistic models are evaluated across repeated predictions.

Question to ask. Ask how calibration would be tested.

Transfer task. Compare predicted probabilities with observed frequencies.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Statistical model

What the model does. Statistical models describe relationships while accounting for variation and uncertainty.

Common misunderstanding. Students may think a fitted line proves causation.

Example. Model association depends on assumptions and variables included.

Question to ask. Ask what residuals and uncertainty show.

Transfer task. Compare alternative models for the same data.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Regression model

What the model does. Regression estimates relationships between outcomes and predictors.

Common misunderstanding. Students may assume the fitted coefficient is automatically causal.

Example. Confounding and design still matter.

Question to ask. Ask whether predictors were assigned or observed.

Transfer task. Use the model for prediction within supported ranges.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Simulation model

What the model does. Computer simulations implement rules or equations to explore system behaviour.

Common misunderstanding. Students may treat simulation output as reality.

Example. The result depends on model assumptions and parameters.

Question to ask. Ask what was programmed and validated.

Transfer task. Change one parameter and examine sensitivity.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Agent-based model

What the model does. Agent-based models simulate many interacting individual units.

Common misunderstanding. Students may think agents are real people or organisms rather than programmed representations.

Example. Simple rules can produce complex system behaviour.

Question to ask. Ask what each agent can perceive or do.

Transfer task. Compare emergent patterns across rule changes.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Monte Carlo model

What the model does. Monte Carlo methods use repeated random sampling to explore uncertainty or probability.

Common misunderstanding. Students may think random sampling makes results unreliable.

Example. Many random trials can estimate distributions or probabilities.

Question to ask. Ask what probability distribution drives the simulation.

Transfer task. Compare estimates with increasing trial count.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Network model

What the model does. Network models represent entities as nodes connected by relationships.

Common misunderstanding. Students may interpret spatial position literally when only connections matter.

Example. Food webs, social networks and power grids can be network representations.

Question to ask. Ask what nodes and edges mean.

Transfer task. Change network connectivity and predict system effects.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Concept map

What the model does. A concept map models relationships among ideas using labelled links.

Common misunderstanding. Students may create decorative word clouds without meaningful relationships.

Example. The power lies in the relationship labels.

Question to ask. Ask whether each arrow can be read as a valid sentence.

Transfer task. Revise vague links.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Causal diagram

What the model does. A causal diagram represents proposed cause-and-effect relationships among variables.

Common misunderstanding. Students may treat every arrow as proven causation.

Example. Arrows can encode hypotheses that still require evidence.

Question to ask. Ask what observation could distinguish competing diagrams.

Transfer task. Compare confounding structures.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Flow chart

What the model does. A flow chart represents ordered processes or decisions.

Common misunderstanding. Students may assume every process is strictly linear.

Example. Some systems have loops, branches and feedback.

Question to ask. Ask where decisions and feedback occur.

Transfer task. Convert a linear chart into a feedback system when appropriate.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Systems model

What the model does. A systems model represents components, flows, feedbacks and boundaries.

Common misunderstanding. Students may analyse parts independently and miss interactions.

Example. Whole-system behaviour can emerge from connected components.

Question to ask. Ask what enters, leaves and feeds back.

Transfer task. Apply to ecosystems, circuits, climate or body systems.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Feedback model

What the model does. Feedback models show output influencing future system behaviour.

Common misunderstanding. Students may think all feedback amplifies change.

Example. Negative feedback can stabilise; positive feedback can amplify.

Question to ask. Ask whether the loop counteracts or reinforces change.

Transfer task. Trace one loop step by step.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Black-box model

What the model does. A black-box model focuses on inputs and outputs without detailing internal mechanism.

Common misunderstanding. Students may assume lack of internal detail makes the model useless.

Example. Some engineering and statistical tasks only require reliable input-output mapping.

Question to ask. Ask when mechanism matters and when prediction is enough.

Transfer task. Compare black-box and mechanistic models.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Mechanistic model

What the model does. A mechanistic model represents intermediate processes connecting cause and effect.

Common misunderstanding. Students may confuse plausibility with proof.

Example. Mechanisms must still be checked against data.

Question to ask. Ask which intermediate step could be measured.

Transfer task. Use condition-process-effect reasoning.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Empirical model

What the model does. An empirical model fits observed patterns without necessarily representing full mechanism.

Common misunderstanding. Students may treat fit as explanation.

Example. A curve can predict within range while revealing little about cause.

Question to ask. Ask whether the model explains or only predicts.

Transfer task. Compare empirical and mechanistic approaches.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Analogy model

What the model does. An analogy uses a familiar system to illuminate an unfamiliar one.

Common misunderstanding. Students may transfer features that the analogy was never meant to represent.

Example. Electric circuits compared with water flow can help some ideas while misleading others.

Question to ask. Ask exactly where the analogy stops working.

Transfer task. List useful and misleading mappings.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Historical model

What the model does. Historical models show how scientific explanations changed with evidence.

Common misunderstanding. Students may think old models were foolish rather than reasonable under available evidence.

Example. Scientific progress often replaces useful models when new observations reveal limitations.

Question to ask. Ask what evidence forced revision.

Transfer task. Compare geocentric, heliocentric or atomic models.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Prototype model

What the model does. A prototype represents a proposed engineered solution for testing.

Common misunderstanding. Students may confuse scientific model and final engineered product.

Example. Prototypes intentionally simplify or approximate aspects of the final system.

Question to ask. Ask what criterion the prototype tests.

Transfer task. Use the Engineering Design owner for iteration.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Digital twin

What the model does. A digital twin is a computational representation updated with data from a physical system.

Common misunderstanding. Students may think it is an exact virtual copy.

Example. Quality depends on sensors, assumptions and update methods.

Question to ask. Ask which measurements keep the twin aligned with reality.

Transfer task. Compare predicted and observed system behaviour.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Scale model limitation

What the model does. Scale models preserve some ratios but not necessarily all physical behaviours.

Common misunderstanding. Students may assume a small airplane behaves exactly like a full-size aircraft.

Example. Fluid flow, material thickness and gravity do not always scale simply.

Question to ask. Ask which physical laws change with scale.

Transfer task. Use dimensionless reasoning conceptually at advanced level.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Colour-coded model

What the model does. Colour is often used to distinguish categories or quantities.

Common misunderstanding. Students may assume displayed colours are real.

Example. Weather maps, molecular models and telescope images often use arbitrary or false colour.

Question to ask. Ask what the legend says.

Transfer task. Interpret colour as data encoding.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Arrow model

What the model does. Arrows can represent movement, force, energy, sequence, causation or flow.

Common misunderstanding. Students may assume all arrows mean the same thing.

Example. Arrow meaning is model-specific.

Question to ask. Ask what quantity or relationship the arrow encodes.

Transfer task. Compare arrows across three diagrams.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Omitted-detail model

What the model does. Models often omit irrelevant features to reduce cognitive load.

Common misunderstanding. Students may think omitted components do not exist.

Example. A digestive diagram may omit lungs and muscles while still serving its purpose.

Question to ask. Ask what was intentionally left out.

Transfer task. Decide whether the omission matters for the current question.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Model validity

What the model does. A model is valid only for certain purposes, ranges and conditions.

Common misunderstanding. Students may ask whether a model is simply true or false.

Example. Models can be useful approximations without being complete.

Question to ask. Ask what prediction the model gets right.

Transfer task. State the range where it is useful.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Model comparison

What the model does. Two models can coexist because they answer different questions.

Common misunderstanding. Students may think one model must eliminate all others.

Example. Ray and wave models of light highlight different behaviours.

Question to ask. Ask which question each model handles better.

Transfer task. Choose the model before solving.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Model revision

What the model does. Models should change when evidence exposes important failures.

Common misunderstanding. Students may think changing a model means Science cannot be trusted.

Example. Revision is a normal response to improved evidence.

Question to ask. Ask what new evidence the old model cannot explain.

Transfer task. Propose the smallest useful revision.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Model uncertainty

What the model does. Predictions can vary because inputs, parameters and structure are uncertain.

Common misunderstanding. Students may read one model output as exact future truth.

Example. Ensembles and sensitivity analysis show ranges of plausible outcomes.

Question to ask. Ask which uncertainty dominates.

Transfer task. Report ranges rather than one precise number when appropriate.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Model validation

What the model does. Validation compares model outputs with observations not used simply to fit the model.

Common misunderstanding. Students may think a model is valid because it matches the data used to build it.

Example. Out-of-sample testing is stronger evidence of predictive usefulness.

Question to ask. Ask which observations were reserved for testing.

Transfer task. Compare calibration and validation.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Model calibration

What the model does. Calibration adjusts parameters so a model better matches known observations.

Common misunderstanding. Students may think calibration proves the model is correct.

Example. Many parameter combinations can fit limited data.

Question to ask. Ask whether fitted parameters have physical meaning.

Transfer task. Test against new data afterward.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Model sensitivity

What the model does. Sensitivity analysis tests how strongly outputs change when inputs or assumptions change.

Common misunderstanding. Students may focus on the headline output without checking fragility.

Example. A robust conclusion should survive reasonable variation.

Question to ask. Ask which parameter most changes the result.

Transfer task. Use simple spreadsheet simulations.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Model communication

What the model does. A model should make its assumptions and purpose clear to the audience.

Common misunderstanding. Students may present a diagram without legend or explanation.

Example. Titles, labels and captions help users interpret the representation.

Question to ask. Ask whether another student can explain the model without the creator present.

Transfer task. Revise ambiguous symbols.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

Model ethics

What the model does. Models can influence decisions, so hidden assumptions and biases matter.

Common misunderstanding. Students may think mathematical form makes a model neutral.

Example. Data selection and objectives can embed value-laden choices.

Question to ask. Ask who is affected by model errors.

Transfer task. Separate technical performance from decision criteria.

The deeper lesson is that model quality is relative to purpose. A model can be excellent for one question and poor for another. Students should therefore state what the model represents, what relationship it preserves, what it omits and what evidence could reveal its limits.

A twelve-week scientific-modelling programme

1. Week 1: representation, purpose and limitation.
2. Week 2: diagrams, arrows and colour conventions.
3. Week 3: life cycles, food webs and systems.
4. Week 4: particle, atomic and molecular models.
5. Week 5: cell and body-system models.
6. Week 6: force, energy, circuit and ray models.
7. Week 7: Earth and Solar System models.
8. Week 8: equations, linear and proportional models.
9. Week 9: graphs, statistics and probability models.
10. Week 10: simulations, networks and feedback.
11. Week 11: calibration, validation and uncertainty.
12. Week 12: comparing, criticising and revising models.

When tuition may help with scientific models

Extra support can help when a student memorises diagrams without understanding what they represent, treats equations as recipes or repeatedly transfers a model beyond its useful limits. A tutor can ask the learner to map model to reality, make a prediction and identify a limitation before revealing the answer.

For current Primary 3–6 and PSLE programme information, use Primary Science Tuition Sengkang. Secondary modelling coverage here is educational transition material.

Frequently asked questions

What is a scientific model?

A scientific model is a simplified representation used to describe, explain, predict or communicate aspects of a real system or phenomenon.

What are the main types of scientific models?

Common categories include physical, conceptual, visual, mathematical and computational models, although categories overlap.

Are scientific models supposed to be exact?

No. Every model simplifies. The important question is whether the simplification is useful for the intended purpose and whether limitations are understood.

Why do scientific models change?

New evidence, better instruments or new questions can reveal limitations and motivate revisions.

Is an equation a model?

Yes. Equations can represent relationships among quantities under defined assumptions and conditions.

Is a diagram a scientific model?

Often yes, if it represents selected structures, processes or relationships and is used to explain or predict.

Further reading

• Cambridge International: Scientific Modelling
• NSTA: Using Models to Teach Science
• RSC Education: How to Teach Scientific Models
• AES Lower Secondary Science: Models

Final operating rule

Never ask only whether a model is “correct”. Ask what it represents, what it is for, what relationship it preserves, what it leaves out, and what evidence would reveal its limits. Science becomes more powerful when students can choose, use, compare and revise models rather than merely memorise them.

Physical scale model — modelling clinic 1

Begin with a new representation related to physical scale model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may assume every classroom model is accurately scaled in every dimension.. Use the example: A planet-size model can preserve diameter ratios while a separate distance model handles orbital spacing. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask which dimensions are scaled and which are not. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Build or inspect two Solar System models and compare what each communicates. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Replica model — modelling clinic 1

Begin with a new representation related to replica model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think a replica automatically explains how the object works.. Use the example: An anatomical heart replica can show chambers without reproducing living tissue behaviour. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask whether the model shows structure, mechanism or both. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Compare a static replica with an animated flow model. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Cross-section model — modelling clinic 1

Begin with a new representation related to cross-section model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think internal parts are actually arranged as a flat slice.. Use the example: Earth-interior diagrams are cross-sectional representations of three-dimensional layers. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what direction and plane the section represents. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Compare cross-sections taken at different orientations. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Exploded diagram — modelling clinic 1

Begin with a new representation related to exploded diagram. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think the parts are normally physically separated by the displayed gaps.. Use the example: Machines and organs can be shown pulled apart for clarity. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what connections are hidden by the separation. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Reassemble the conceptual system in the correct order. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Life-cycle model — modelling clinic 1

Begin with a new representation related to life-cycle model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think the cycle must begin at the top or that every organism follows identical stages.. Use the example: Different insects can have different developmental stages while still forming life cycles. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what changes between stages and which transitions are essential. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Redraw the cycle starting at a different stage. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Food-chain model — modelling clinic 1

Begin with a new representation related to food-chain model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think an ecosystem has only one linear route.. Use the example: Real organisms usually participate in networks rather than single chains. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what relationships are omitted. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Expand one chain into a food web. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Food-web model — modelling clinic 1

Begin with a new representation related to food-web model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may read arrows in the wrong direction or assume it predicts one fixed outcome.. Use the example: Arrows represent a convention for transfer and indirect outcomes can vary. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what each arrow means before tracing consequences. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Predict two plausible effects of changing one population. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Water-cycle model — modelling clinic 1

Begin with a new representation related to water-cycle model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think every water molecule follows one circular route in the same order.. Use the example: Water can remain in oceans, ice or groundwater for very different periods. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask which reservoirs and pathways the diagram omits. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Convert the circle into a network model. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Rock-cycle model — modelling clinic 1

Begin with a new representation related to rock-cycle model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think all rocks follow one mandatory sequence.. Use the example: Many pathways are possible depending on geological history. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask whether every arrow is reversible and under what process. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Trace three different routes from one rock type. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Particle model — modelling clinic 1

Begin with a new representation related to particle model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may draw particles as tiny visible chunks of the substance.. Use the example: Particle size, colour and spacing in diagrams are usually symbolic. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what each dot stands for and whether spaces are to scale. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Use the model to predict compression or diffusion. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Solid particle model — modelling clinic 1

Begin with a new representation related to solid particle model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think particles stop moving completely.. Use the example: Particles can vibrate even when the solid keeps its macroscopic shape. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what heating changes before melting. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Compare cold and warmer solid particle-motion representations. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Liquid particle model — modelling clinic 1

Begin with a new representation related to liquid particle model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think liquid particles are much farther apart than solid particles.. Use the example: Many liquids and solids have relatively similar particle spacing compared with gases. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what explains flow if spacing changes only modestly. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Compare arrangement rather than exaggerating distance. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Gas particle model — modelling clinic 1

Begin with a new representation related to gas particle model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may draw gas only at the top of a container.. Use the example: Gas fills available volume under ordinary conditions. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask why particles are represented throughout the container. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Predict what compression changes. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Diffusion model — modelling clinic 1

Begin with a new representation related to diffusion model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think particles intentionally move from high to low concentration.. Use the example: Random motion creates a statistical net spread. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask whether individual particles can move in either direction. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Use a simple simulation to track many particles. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Atomic model — modelling clinic 1

Begin with a new representation related to atomic model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think the latest diagram is a literal photograph of an atom.. Use the example: Models from Dalton to nuclear and quantum descriptions serve different purposes. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what evidence required model revision. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Compare two atomic models and identify what each explains. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Bohr-style atom model — modelling clinic 1

Begin with a new representation related to bohr-style atom model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think electrons orbit like planets on fixed circular tracks.. Use the example: The model is useful for some patterns but not a literal trajectory picture. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask which chemical patterns it helps explain. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Compare with a more modern electron-cloud description at suitable level. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Ball-and-stick model — modelling clinic 1

Begin with a new representation related to ball-and-stick model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think bond lengths, atom sizes and colours are literally represented.. Use the example: The sticks and colours are conventions to make structure visible. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what information the model exaggerates. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Compare with space-filling models. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Space-filling molecular model — modelling clinic 1

Begin with a new representation related to space-filling molecular model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may find bonds harder to see and assume they disappeared.. Use the example: Different representations highlight different features. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask which model is better for shape versus connectivity. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Choose a model for a stated question. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Ionic lattice model — modelling clinic 1

Begin with a new representation related to ionic lattice model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may treat ionic compounds as separate molecules like water.. Use the example: The extended lattice explains many properties better than a molecular picture. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what repeating pattern is shown. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Relate structure to melting or conductivity at appropriate level. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Metallic model — modelling clinic 1

Begin with a new representation related to metallic model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may picture metal atoms moving freely through the wire.. Use the example: The lattice remains largely fixed while electrons are mobile in the model. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what feature explains conductivity. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Compare with an insulator model. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Cell model — modelling clinic 1

Begin with a new representation related to cell model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think textbook cell diagrams are drawn to scale or that every cell has the same shape.. Use the example: Actual cells differ greatly and organelle proportions vary. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask which features are universal and which are specialised. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Compare a diagram with a microscope image. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Organ model — modelling clinic 1

Begin with a new representation related to organ model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think omitted parts do not exist or do not matter.. Use the example: A digestive-system diagram intentionally excludes many organs outside the focus. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what the model leaves out to reduce complexity. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Add one omitted interaction to the model. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Body-system model — modelling clinic 1

Begin with a new representation related to body-system model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may treat systems as isolated chapters.. Use the example: Circulatory, respiratory and digestive systems interact continuously. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what moves between systems. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Draw a cross-system transport model. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Photosynthesis model — modelling clinic 1

Begin with a new representation related to photosynthesis model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may reduce it to a memorised equation without cellular context.. Use the example: Different models show gas exchange, chloroplast process or energy conversion. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what scale the model operates at. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Translate between word equation and system diagram. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Respiration model — modelling clinic 1

Begin with a new representation related to respiration model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may equate respiration with breathing.. Use the example: Breathing is organism-level gas movement; respiration is cellular chemistry. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what scale each process belongs to. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Connect lungs, circulation and cells in one model. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Genetic model — modelling clinic 1

Begin with a new representation related to genetic model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think one gene determines most complex traits completely.. Use the example: Many traits involve multiple genes and environment. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask which assumptions a simple Punnett square makes. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Compare single-gene and polygenic situations conceptually. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Evolutionary tree — modelling clinic 1

Begin with a new representation related to evolutionary tree. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may read the tree as a ladder of progress.. Use the example: Modern species occur at tips and share ancestors rather than one current species turning into another. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask which pair shares the most recent common ancestor. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Rotate branches and check whether relationships change. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Population model — modelling clinic 1

Begin with a new representation related to population model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think a smooth curve predicts exact individual counts.. Use the example: Models simplify complex environments and parameter variation. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask which assumptions generate the curve. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Change one parameter and inspect sensitivity. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Ecosystem box model — modelling clinic 1

Begin with a new representation related to ecosystem box model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may assume arrows mean physical pipes.. Use the example: Arrows represent flows or relationships. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what quantity each arrow carries. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Add missing stores and feedbacks. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Force-arrow model — modelling clinic 1

Begin with a new representation related to force-arrow model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may draw arrows for motion rather than force.. Use the example: Arrows should represent interactions and direction, often with length indicating magnitude qualitatively. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask which object exerts each force. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Remove arrows that do not represent interactions. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Free-body diagram — modelling clinic 1

Begin with a new representation related to free-body diagram. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may include forces the object exerts on others.. Use the example: The model deliberately focuses on forces acting on the chosen object. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask ‘force on what, by what?’ for each arrow. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Compare two-object systems with separate diagrams. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Motion graph — modelling clinic 1

Begin with a new representation related to motion graph. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may treat the graph as a literal picture of the path.. Use the example: Graph slope and area can carry physical meaning depending on axes. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what each axis represents. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Describe motion without drawing a route picture. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Energy-flow model — modelling clinic 1

Begin with a new representation related to energy-flow model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may treat energy as a visible fluid substance.. Use the example: Arrows represent accounting relationships rather than literal streams. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what system boundary is used. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Trace input, useful output and dissipated pathways. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Ray model of light — modelling clinic 1

Begin with a new representation related to ray model of light. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think rays are physical lines in space.. Use the example: Rays are geometric representations useful for reflection and imaging. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what wave properties the ray model omits. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Choose ray versus wave model for a question. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Wave model — modelling clinic 1

Begin with a new representation related to wave model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think the drawn wave is the path a particle travels.. Use the example: For many waves, medium particles oscillate while the disturbance propagates. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what direction energy travels versus particle motion. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Compare transverse drawings with actual medium behaviour. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Circuit model — modelling clinic 1

Begin with a new representation related to circuit model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may rely on spatial layout instead of topology.. Use the example: Two differently drawn diagrams can represent the same circuit. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask which nodes are electrically connected. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Redraw the circuit without changing connectivity. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Current model — modelling clinic 1

Begin with a new representation related to current model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think current is used up by components.. Use the example: In simple steady circuits, current relationships depend on connection topology. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask where charge accumulates or continues. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Compare series and parallel pathways. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Potential-difference model — modelling clinic 1

Begin with a new representation related to potential-difference model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may picture voltage as a substance flowing.. Use the example: Voltage is associated with relationships between points, not a material flow. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask which two points the measurement refers to. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Compare voltmeter placements. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Magnetic-field model — modelling clinic 1

Begin with a new representation related to magnetic-field model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think field lines are physical strings.. Use the example: Field-line density is representational, not literal material density. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what a compass would do at different points. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Predict interaction without touching the magnet. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Gravitational-field model — modelling clinic 1

Begin with a new representation related to gravitational-field model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think gravity only exists near surfaces.. Use the example: Field strength changes with position but does not abruptly vanish. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what happens to field with distance. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Use orbits as evidence of continuing gravity. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Solar-system model — modelling clinic 1

Begin with a new representation related to solar-system model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may assume one model preserves both size and spacing accurately.. Use the example: Classroom models usually compromise because real scale differences are enormous. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask whether size and distance use the same scale. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Build separate size and distance models. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Moon-phase model — modelling clinic 1

Begin with a new representation related to moon-phase model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think phase diagrams show Earth’s shadow.. Use the example: The model shows the Moon is always half illuminated by the Sun except during eclipse geometry. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what an observer on Earth sees. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Move the observer viewpoint explicitly. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Physical scale model — modelling clinic 2

Begin with a new representation related to physical scale model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may assume every classroom model is accurately scaled in every dimension.. Use the example: A planet-size model can preserve diameter ratios while a separate distance model handles orbital spacing. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask which dimensions are scaled and which are not. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Build or inspect two Solar System models and compare what each communicates. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Replica model — modelling clinic 2

Begin with a new representation related to replica model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think a replica automatically explains how the object works.. Use the example: An anatomical heart replica can show chambers without reproducing living tissue behaviour. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask whether the model shows structure, mechanism or both. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Compare a static replica with an animated flow model. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Cross-section model — modelling clinic 2

Begin with a new representation related to cross-section model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think internal parts are actually arranged as a flat slice.. Use the example: Earth-interior diagrams are cross-sectional representations of three-dimensional layers. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what direction and plane the section represents. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Compare cross-sections taken at different orientations. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Exploded diagram — modelling clinic 2

Begin with a new representation related to exploded diagram. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think the parts are normally physically separated by the displayed gaps.. Use the example: Machines and organs can be shown pulled apart for clarity. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what connections are hidden by the separation. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Reassemble the conceptual system in the correct order. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Life-cycle model — modelling clinic 2

Begin with a new representation related to life-cycle model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think the cycle must begin at the top or that every organism follows identical stages.. Use the example: Different insects can have different developmental stages while still forming life cycles. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what changes between stages and which transitions are essential. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Redraw the cycle starting at a different stage. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Food-chain model — modelling clinic 2

Begin with a new representation related to food-chain model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think an ecosystem has only one linear route.. Use the example: Real organisms usually participate in networks rather than single chains. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what relationships are omitted. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Expand one chain into a food web. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Food-web model — modelling clinic 2

Begin with a new representation related to food-web model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may read arrows in the wrong direction or assume it predicts one fixed outcome.. Use the example: Arrows represent a convention for transfer and indirect outcomes can vary. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what each arrow means before tracing consequences. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Predict two plausible effects of changing one population. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Water-cycle model — modelling clinic 2

Begin with a new representation related to water-cycle model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think every water molecule follows one circular route in the same order.. Use the example: Water can remain in oceans, ice or groundwater for very different periods. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask which reservoirs and pathways the diagram omits. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Convert the circle into a network model. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Rock-cycle model — modelling clinic 2

Begin with a new representation related to rock-cycle model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think all rocks follow one mandatory sequence.. Use the example: Many pathways are possible depending on geological history. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask whether every arrow is reversible and under what process. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Trace three different routes from one rock type. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Particle model — modelling clinic 2

Begin with a new representation related to particle model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may draw particles as tiny visible chunks of the substance.. Use the example: Particle size, colour and spacing in diagrams are usually symbolic. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what each dot stands for and whether spaces are to scale. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Use the model to predict compression or diffusion. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Solid particle model — modelling clinic 2

Begin with a new representation related to solid particle model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think particles stop moving completely.. Use the example: Particles can vibrate even when the solid keeps its macroscopic shape. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what heating changes before melting. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Compare cold and warmer solid particle-motion representations. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Liquid particle model — modelling clinic 2

Begin with a new representation related to liquid particle model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think liquid particles are much farther apart than solid particles.. Use the example: Many liquids and solids have relatively similar particle spacing compared with gases. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what explains flow if spacing changes only modestly. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Compare arrangement rather than exaggerating distance. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Gas particle model — modelling clinic 2

Begin with a new representation related to gas particle model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may draw gas only at the top of a container.. Use the example: Gas fills available volume under ordinary conditions. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask why particles are represented throughout the container. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Predict what compression changes. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Diffusion model — modelling clinic 2

Begin with a new representation related to diffusion model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think particles intentionally move from high to low concentration.. Use the example: Random motion creates a statistical net spread. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask whether individual particles can move in either direction. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Use a simple simulation to track many particles. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Atomic model — modelling clinic 2

Begin with a new representation related to atomic model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think the latest diagram is a literal photograph of an atom.. Use the example: Models from Dalton to nuclear and quantum descriptions serve different purposes. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what evidence required model revision. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Compare two atomic models and identify what each explains. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Bohr-style atom model — modelling clinic 2

Begin with a new representation related to bohr-style atom model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think electrons orbit like planets on fixed circular tracks.. Use the example: The model is useful for some patterns but not a literal trajectory picture. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask which chemical patterns it helps explain. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Compare with a more modern electron-cloud description at suitable level. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Ball-and-stick model — modelling clinic 2

Begin with a new representation related to ball-and-stick model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think bond lengths, atom sizes and colours are literally represented.. Use the example: The sticks and colours are conventions to make structure visible. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what information the model exaggerates. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Compare with space-filling models. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Space-filling molecular model — modelling clinic 2

Begin with a new representation related to space-filling molecular model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may find bonds harder to see and assume they disappeared.. Use the example: Different representations highlight different features. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask which model is better for shape versus connectivity. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Choose a model for a stated question. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Ionic lattice model — modelling clinic 2

Begin with a new representation related to ionic lattice model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may treat ionic compounds as separate molecules like water.. Use the example: The extended lattice explains many properties better than a molecular picture. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what repeating pattern is shown. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Relate structure to melting or conductivity at appropriate level. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Metallic model — modelling clinic 2

Begin with a new representation related to metallic model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may picture metal atoms moving freely through the wire.. Use the example: The lattice remains largely fixed while electrons are mobile in the model. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what feature explains conductivity. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Compare with an insulator model. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Cell model — modelling clinic 2

Begin with a new representation related to cell model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think textbook cell diagrams are drawn to scale or that every cell has the same shape.. Use the example: Actual cells differ greatly and organelle proportions vary. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask which features are universal and which are specialised. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Compare a diagram with a microscope image. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Organ model — modelling clinic 2

Begin with a new representation related to organ model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think omitted parts do not exist or do not matter.. Use the example: A digestive-system diagram intentionally excludes many organs outside the focus. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what the model leaves out to reduce complexity. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Add one omitted interaction to the model. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Body-system model — modelling clinic 2

Begin with a new representation related to body-system model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may treat systems as isolated chapters.. Use the example: Circulatory, respiratory and digestive systems interact continuously. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what moves between systems. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Draw a cross-system transport model. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Photosynthesis model — modelling clinic 2

Begin with a new representation related to photosynthesis model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may reduce it to a memorised equation without cellular context.. Use the example: Different models show gas exchange, chloroplast process or energy conversion. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what scale the model operates at. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Translate between word equation and system diagram. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Respiration model — modelling clinic 2

Begin with a new representation related to respiration model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may equate respiration with breathing.. Use the example: Breathing is organism-level gas movement; respiration is cellular chemistry. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what scale each process belongs to. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Connect lungs, circulation and cells in one model. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Genetic model — modelling clinic 2

Begin with a new representation related to genetic model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think one gene determines most complex traits completely.. Use the example: Many traits involve multiple genes and environment. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask which assumptions a simple Punnett square makes. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Compare single-gene and polygenic situations conceptually. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Evolutionary tree — modelling clinic 2

Begin with a new representation related to evolutionary tree. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may read the tree as a ladder of progress.. Use the example: Modern species occur at tips and share ancestors rather than one current species turning into another. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask which pair shares the most recent common ancestor. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Rotate branches and check whether relationships change. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Population model — modelling clinic 2

Begin with a new representation related to population model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think a smooth curve predicts exact individual counts.. Use the example: Models simplify complex environments and parameter variation. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask which assumptions generate the curve. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Change one parameter and inspect sensitivity. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Ecosystem box model — modelling clinic 2

Begin with a new representation related to ecosystem box model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may assume arrows mean physical pipes.. Use the example: Arrows represent flows or relationships. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what quantity each arrow carries. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Add missing stores and feedbacks. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Force-arrow model — modelling clinic 2

Begin with a new representation related to force-arrow model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may draw arrows for motion rather than force.. Use the example: Arrows should represent interactions and direction, often with length indicating magnitude qualitatively. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask which object exerts each force. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Remove arrows that do not represent interactions. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Free-body diagram — modelling clinic 2

Begin with a new representation related to free-body diagram. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may include forces the object exerts on others.. Use the example: The model deliberately focuses on forces acting on the chosen object. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask ‘force on what, by what?’ for each arrow. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Compare two-object systems with separate diagrams. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Motion graph — modelling clinic 2

Begin with a new representation related to motion graph. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may treat the graph as a literal picture of the path.. Use the example: Graph slope and area can carry physical meaning depending on axes. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what each axis represents. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Describe motion without drawing a route picture. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Energy-flow model — modelling clinic 2

Begin with a new representation related to energy-flow model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may treat energy as a visible fluid substance.. Use the example: Arrows represent accounting relationships rather than literal streams. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what system boundary is used. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Trace input, useful output and dissipated pathways. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Ray model of light — modelling clinic 2

Begin with a new representation related to ray model of light. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think rays are physical lines in space.. Use the example: Rays are geometric representations useful for reflection and imaging. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what wave properties the ray model omits. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Choose ray versus wave model for a question. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Wave model — modelling clinic 2

Begin with a new representation related to wave model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think the drawn wave is the path a particle travels.. Use the example: For many waves, medium particles oscillate while the disturbance propagates. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what direction energy travels versus particle motion. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Compare transverse drawings with actual medium behaviour. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Circuit model — modelling clinic 2

Begin with a new representation related to circuit model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may rely on spatial layout instead of topology.. Use the example: Two differently drawn diagrams can represent the same circuit. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask which nodes are electrically connected. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Redraw the circuit without changing connectivity. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Current model — modelling clinic 2

Begin with a new representation related to current model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think current is used up by components.. Use the example: In simple steady circuits, current relationships depend on connection topology. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask where charge accumulates or continues. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Compare series and parallel pathways. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Potential-difference model — modelling clinic 2

Begin with a new representation related to potential-difference model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may picture voltage as a substance flowing.. Use the example: Voltage is associated with relationships between points, not a material flow. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask which two points the measurement refers to. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Compare voltmeter placements. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Magnetic-field model — modelling clinic 2

Begin with a new representation related to magnetic-field model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think field lines are physical strings.. Use the example: Field-line density is representational, not literal material density. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what a compass would do at different points. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Predict interaction without touching the magnet. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Gravitational-field model — modelling clinic 2

Begin with a new representation related to gravitational-field model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think gravity only exists near surfaces.. Use the example: Field strength changes with position but does not abruptly vanish. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what happens to field with distance. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Use orbits as evidence of continuing gravity. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Solar-system model — modelling clinic 2

Begin with a new representation related to solar-system model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may assume one model preserves both size and spacing accurately.. Use the example: Classroom models usually compromise because real scale differences are enormous. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask whether size and distance use the same scale. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Build separate size and distance models. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.

Moon-phase model — modelling clinic 2

Begin with a new representation related to moon-phase model. Ask the learner what real system it stands for and what question it is designed to answer. The learner must identify the mapping between model components and real components before using the model to predict anything.

Surface the common misunderstanding: Students may think phase diagrams show Earth’s shadow.. Use the example: The model shows the Moon is always half illuminated by the Sun except during eclipse geometry. Ask what false prediction would follow if the model were interpreted too literally. This reveals why knowing a model’s conventions is part of scientific knowledge.

Now ask: Ask what an observer on Earth sees. The student should name at least one omitted feature and decide whether that omission matters for the current purpose. If it does, choose or build a different model rather than forcing the original one to do every job.

Finish with the transfer task: Move the observer viewpoint explicitly. Return several days later with another Science branch. Durable modelling skill appears when the learner can explain usefulness and limitation without relying on the original diagram.