The 20-route learning estate
eduKateSengkang is organised as a Learning Castle: existing subject hubs, level routes, examination routes and learning-system pages retain their jobs. This page is the master upgrade directory. It does not replace those owners. It makes the work visible, assigns every upgrade to one route, and gives new or substantially revised articles stable IDs so later batches can be connected without losing track of what is complete.
Numbering rule
Each route has a -000 hub pointer. Article slots then use reserved tens: -010, -020, -030 and so on. The first upgrade programme reserves up to 150 article slots per route, ending at -1500. Existing high-value URLs are upgraded in place wherever practical; the ID identifies the editorial job, not a requirement to create a new URL.
| Route | Hub ID | Primary job | Existing owner / destination | Reserved article IDs | Status |
|---|---|---|---|---|---|
| SK-01 | SK-01-000 | Homepage, Sengkang Tuition, commercial/navigation/root accuracy | Homepage / Tuition Centre owner | SK-01-010–SK-01-1500 | OPEN |
| SK-02 | SK-02-000 | Primary 1–3 English | Primary English Learning Hub | SK-02-010–SK-02-1500 | OPEN |
| SK-03 | SK-03-000 | Primary 4–6 English + PSLE English | Primary English Learning Hub / PSLE Learning Guide | SK-03-010–SK-03-1500 | OPEN |
| SK-04 | SK-04-000 | Secondary 1–2 English | English Hub | SK-04-010–SK-04-1500 | OPEN |
| SK-05 | SK-05-000 | Secondary 3–4 English + SEC English | English Hub | SK-05-010–SK-05-1500 | OPEN |
| SK-06 | SK-06-000 | Vocabulary, grammar, reading, writing and English skills | Complete English Index | SK-06-010–SK-06-1500 | OPEN |
| SK-07 | SK-07-000 | Primary 1–3 Mathematics | Mathematics Hub | SK-07-010–SK-07-1500 | OPEN |
| SK-08 | SK-08-000 | Primary 4–6 Mathematics + PSLE Mathematics | Mathematics Hub / PSLE Learning Guide | SK-08-010–SK-08-1500 | OPEN |
| SK-09 | SK-09-000 | Secondary 1–2 Mathematics | Mathematics Hub | SK-09-010–SK-09-1500 | OPEN |
| SK-10 | SK-10-000 | Secondary 3–4 Mathematics + SEC Mathematics | Mathematics Hub | SK-10-010–SK-10-1500 | OPEN |
| SK-11 | SK-11-000 | Additional Mathematics | Additional Mathematics owner | SK-11-010–SK-11-1500 | OPEN |
| SK-12 | SK-12-000 | Primary 3–4 Science | Science Hub | SK-12-010–SK-12-1500 | OPEN |
| SK-13 | SK-13-000 | Primary 5–6 Science + PSLE Science | Science Hub / PSLE Science Learning Guide | SK-13-010–SK-13-1500 | OPEN |
| SK-14 | SK-14-000 | Secondary Science + scientific reasoning | Science Hub | SK-14-010–SK-14-1500 | OPEN |
| SK-15 | SK-15-000 | Learning Castle, Learning Runtime and study methods | Learning Runtime Hub | SK-15-010–SK-15-1500 | OPEN |
| SK-16 | SK-16-000 | Examination performance, revision, assessment and error repair | Examination Craft | SK-16-010–SK-16-1500 | OPEN |
| SK-17 | SK-17-000 | Parent guides, tuition, teaching and student support | Parents’ Guide | SK-17-010–SK-17-1500 | OPEN |
| SK-18 | SK-18-000 | Algorithms, computing and advanced mathematics | Algorithms & Computing Hub | SK-18-010–SK-18-1500 | OPEN |
| SK-19 | SK-19-000 | Advanced science and world-knowledge science material | Complete Science Index | SK-19-010–SK-19-1500 | OPEN |
| SK-20 | SK-20-000 | Estate archaeology: duplication, location leakage, orphan control, cannibalisation and consolidation candidates | Learning Castle Registry | SK-20-010–SK-20-1500 | OPEN |
Article register
The first-wave titles and status ledger are live in the eduKate Sengkang Article Register | SK-01 to SK-20. Use it to claim the next article ID, see protected owners and avoid duplicating work already active in another branch.
Protection-first reader standard
All 20 branches now follow the eduKate Sengkang Reader Experience Standard: protect strong pages, connect isolated pages, improve formatting only where it helps, use bounded surgery for specific defects, and modernise only when the existing article no longer completes its reader job.
Article state
Every inspected URL receives one state before work begins: PROTECT for ranking or strategically sensitive owners; KEEP for sound pages needing no substantial rewrite; MODERNISE for useful but outdated pages; SURGERY for small bounded repairs; RETARGET for pages that need a distinct adjacent search job; CONSOLIDATION CANDIDATE for overlapping intent that requires owner review; LOCATION LEAKAGE for misplaced locality; or HISTORICAL for material worth preserving without major reinvestment.
Completion rule
An article ID becomes complete only when the assigned existing URL or new article has a defined reader job, correct owner, current factual scope, useful internal return path and no unresolved collision with another Sengkang owner. A branch can therefore inspect more than 150 URLs without rewriting 150 pages. The 150 slots are a controlled first-wave capacity, not a quota.
Castle relationship
This programme sits under the existing Learning Castle and follows its one-owner-many-routes rule. English, Mathematics, Science, Examination Craft, Learning Runtime and Algorithms retain their existing canonical roles. The master directory exists to coordinate upgrades and make unfinished work visible; it does not create twenty competing subject hubs.
Complete-index crosswalk
Use the 20 routes above to decide ownership and upgrade work. Use these Complete Archives when the job is enumeration, orphan control or direct deep-article discovery.
English Archive · Mathematics Archive · Science Archive · Examination Archive · Learning Runtime Archive · Algorithms & Computing Archive
Deep fallback discovery
The subject hubs and Complete Archives remain the preferred routes. These live indexes are the final orphan-control layer: they expose every published Page and Post through paginated internal links so newly published or unusually placed content still has a crawlable return path while specialist routing is updated.
Browse every published Page
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Primary 6 Science Learning Guide | Inputs, Outputs, Conservation & Material Tracking for PSLE
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Primary 6 Science Learning Guide | Integrated Multi-Concept Reasoning & Unfamiliar PSLE Setups
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Primary 6 Science Learning Guide | Interactions Within the Environment: Food Chains, Food Webs and Survival
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Primary 6 Science Learning Guide | Investigations, Variables, Fair Tests & Method
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Primary 6 Science Learning Guide | Life Cycles: Stage Order, Growth vs Reproduction, Comparisons & Common PSLE Concept Traps
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Primary 6 Science Learning Guide | Light: Sources, Reflection, Straight-Line Travel, Shadows & Common PSLE Concept Traps
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Primary 6 Science Learning Guide | Living Together: Interdependence, Competition, Shared Resources & Survival for PSLE
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Primary 6 Science Learning Guide | Magnets: Attraction vs Repulsion, Magnetic Materials, Poles, Distance & Common PSLE Concept Traps
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Primary 6 Science Learning Guide | Man’s Impact on the Environment: Conservation, Reforestation, Pollution, Resources & Global Warming for PSLE
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Primary 6 Science Learning Guide | Mass vs Weight, Gravitational Force, Motion & Common PSLE Concept Traps
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Primary 6 Science Learning Guide | Materials: Properties vs Uses, Strength, Waterproofness, Conductors, Insulators & Common PSLE Concept Traps
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Primary 6 Science Learning Guide | Matter, Water Cycle, Light & Heat for PSLE
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Primary 6 Science Learning Guide | Matter: Air Has Mass, Solids vs Liquids vs Gases, Shape, Volume, Compression & Common PSLE Concept Traps
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Primary 6 Science Learning Guide | MCQ Distractors, Elimination & Error Patterns for PSLE
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Primary 6 Science Learning Guide | Measurement, Units, Resolution & Repeatability for PSLE
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Primary 6 Science Learning Guide | Mixed PSLE Science Practice Workshop with Original Worked Answers
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Primary 6 Science Learning Guide | Models, Assumptions, Limits & Scientific Claims for PSLE
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Primary 6 Science Learning Guide | Multi-Step Problem Solving, Constraints & Decision Paths for PSLE
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Primary 6 Science Learning Guide | Observation, Inference, Prediction & Conclusion for PSLE
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Primary 6 Science Learning Guide | Open-Ended Answer Construction, Completeness & Mark-Bearing Science for PSLE
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Primary 6 Science Learning Guide | Operational Definitions, Measurable Criteria & Classification Rules for PSLE
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Primary 6 Science Learning Guide | Photosynthesis: Energy, Matter, Evidence and Explanation
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Primary 6 Science Learning Guide | Plant Food vs Mineral Salts, Photosynthesis, Respiration & Common PSLE Concept Traps
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Primary 6 Science Learning Guide | Plant Transport, Digestion, Respiration & Circulation for PSLE
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Primary 6 Science Learning Guide | Plant Transport: Water vs Food-Carrying Tubes, Roots, Stems, Leaves, Transpiration & Common PSLE Concept Traps
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Primary 6 Science Learning Guide | Practical Planning, Data Recording & Conclusions for PSLE
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Primary 6 Science Learning Guide | Prediction, What-If Reasoning, Extrapolation & Transfer for PSLE
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Primary 6 Science Learning Guide | PSLE Questions, Explanations, Error Analysis & Revision
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Primary 6 Science Learning Guide | Question Deconstruction, Conditions & Constraints for PSLE
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Primary 6 Science Learning Guide | Rates, Time, Change & Comparative Reasoning for PSLE
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Primary 6 Science Learning Guide | Reproduction: Pollination vs Fertilisation, Seeds, Fruits, Dispersal, Fertilised Eggs & Common PSLE Concept Traps
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Primary 6 Science Learning Guide | Respiratory & Circulatory Systems: Oxygen, Carbon Dioxide, Heart, Pulse, Exercise & Common PSLE Concept Traps
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Primary 6 Science Learning Guide | Retrieval, Spaced Review, Interleaving & Long-Term Memory for PSLE
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Primary 6 Science Learning Guide | Safety, Risk Assessment & Responsible Investigation for PSLE
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Primary 6 Science Learning Guide | Sampling, Field Surveys, Populations & Ecological Evidence for PSLE
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Primary 6 Science Learning Guide | Scaling, Ratios, Proportional Thinking & Estimation for PSLE
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Primary 6 Science Learning Guide | Science Reading Comprehension, Dense Question Stems & Information Filtering for PSLE
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Primary 6 Science Learning Guide | Scientific Communication, Findings & Evidence Presentation for PSLE
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Primary 6 Science Learning Guide | Scientific Vocabulary, Precision & Answer Language for PSLE
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Primary 6 Science Learning Guide | Secondary Science Bridge, Independent Learning & Model Transition
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Primary 6 Science Learning Guide | Self-Explanation, Metacognitive Checking & Answer Verification for PSLE
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Primary 6 Science Learning Guide | Sequence, Cycles, Dependencies & System Pathways for PSLE
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Primary 6 Science Learning Guide | Sources vs Forms of Energy, Energy Conversion & Common PSLE Concept Traps
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Primary 6 Science Learning Guide | Testable Questions, Hypotheses & Investigation Design for PSLE
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Primary 6 Science Learning Guide | Water Cycle: Clouds vs Water Vapour, Evaporation, Condensation, Transpiration & Common PSLE Concept Traps
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Primary 6 Science Learning Guide | What-If Changes, System Failure & Counterfactual Reasoning for PSLE
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Primary 6 Science Learning Hub | Concepts, Inquiry, Evidence & PSLE Readiness
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Primary 6 Science Punggol | PSLE Reconstruction & Examination Craft
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Primary 6 Science Sengkang | The Voyage of Water
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Primary 6 Science Tuition Sengkang | 2026 PSLE Science & Scientific Reasoning
Browse every published Post
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How to Learn Cellulosomes and Cohesin–Dockerin Nanomachines: From Cellulose Binding to Multienzyme Lignocellulose Deconstruction
9–14 minutes -
How to Learn Archaeal Ether Lipids and Tetraether Membranes: From the Lipid Divide to GDGT Monolayers and Extreme-Environment Adaptation
9–13 minutes -
How to Learn Microbial Rhodopsins and Retinal-Based Phototrophy: From Bacteriorhodopsin Proton Pumps to Proteorhodopsin Ecology and Optogenetics
10–15 minutes -
How to Learn Scattering-Type Scanning Near-Field Optical Microscopy (s-SNOM) and Nano-FTIR: From Tip-Enhanced Near Fields to Nanoscale Infrared Chemistry and Polaritons
9–13 minutes -
How to Learn X-Ray Photon Correlation Spectroscopy (XPCS): From Coherent Speckle Fluctuations to Nanoscale Dynamics, Glassy Aging and Ultrafast X-Ray Correlations
8–12 minutes -
How to Learn Magneto-Optical Kerr Effect (MOKE) Magnetometry and Microscopy: From Polarization Rotation to Hysteresis, Magnetic Domains and Ultrafast Spin Dynamics
8–12 minutes -
How to Learn Wave Function Collapse: Local Constraints, Entropy, Observation, Propagation and Procedural Generation
9–13 minutes -
How to Learn the Boykov–Kolmogorov Max-Flow Algorithm: Two Search Trees, Grow–Augment–Adopt Phases and Graph-Cut Optimisation
8–13 minutes -
How to Learn Angle-Resolved Photoemission Spectroscopy (ARPES): From the Photoelectric Effect to Band Structure, Fermi Surfaces, Many-Body Self-Energy and Ultrafast Quantum Materials
9–14 minutes -
How to Learn the Shunting Yard Algorithm: Tokens, Operator Stacks, Precedence, Associativity and Expression Parsing
8–11 minutes -
How to Learn Aho–Corasick: Tries, Failure Links, Output Links and One-Pass Multi-Pattern String Matching
8–12 minutes -
How to Learn Surface Acoustic Wave (SAW) Sensors and Acoustofluidics: From Piezoelectric Interdigital Transducers to Biosensing, Particle Control and Quantum Acoustics
6–9 minutes -
How to Learn Optical Coherence Tomography (OCT): From Low-Coherence Interferometry to Retinal Layers, Angiography, Elastography and AI-Assisted 3D Optical Imaging
6–9 minutes -
How to Learn Circular Dichroism (CD) Spectroscopy: From Molecular Chirality and Polarized Light to Protein Folding, Absolute Configuration and Ultrafast Chiral Dynamics
6–8 minutes -
How to Learn Muon Spin Rotation, Relaxation and Resonance (μSR): From Polarized Muons and Local Magnetic Fields to Superconductors, Ion Diffusion and Quantum Materials
6–9 minutes -
How to Learn Fluorescence Lifetime Imaging Microscopy (FLIM): From Excited-State Decay to FRET, Metabolic Imaging, Multiplexing and Photon-Efficient AI-Assisted Microscopy
6–9 minutes -
How to Learn Neutron Reflectometry (NR/PNR): From Scattering-Length Density and Isotope Contrast to Membranes, Magnetic Depth Profiles and Machine-Assisted Interfacial Science
6–8 minutes -
How to Learn Brillouin Light Scattering and Brillouin Microscopy: From Acoustic Phonons to Viscoelasticity, Cellular Mechanics, Magnons and High-Speed Mechanical Imaging
6–9 minutes -
How to Learn Electron Paramagnetic Resonance (EPR/ESR) Spectroscopy: From Unpaired Electron Spins to Hyperfine Structure, Pulsed EPR, Spin Distances and Operando Radical Chemistry
7–10 minutes -
How to Learn Otsu’s Thresholding Algorithm: Histograms, Within-Class Variance, Between-Class Separation and Robust Image Segmentation
8–12 minutes -
How to Learn Prüfer Sequences: Leaf Removal, Tree Codes, Decoding, Degree Counts and Cayley’s Formula
7–11 minutes -
How to Learn Maximum Cardinality Search: Vertex Labels, Perfect Elimination Orderings, Chordal Graph Recognition and Linear-Time Structure
8–11 minutes -
How to Learn Brandes’ Algorithm: Shortest-Path DAGs, Path Counts, Dependency Accumulation and Betweenness Centrality
8–12 minutes -
How to Learn the Remez Exchange Algorithm: Minimax Approximation, Alternation Points, Equiripple Error and Parks–McClellan FIR Design
6–9 minutes -
How to Learn Levinson–Durbin Recursion: Toeplitz Systems, Reflection Coefficients, Yule–Walker Equations and O(n²) Linear Prediction
5–8 minutes -
Kabsch–Umeyama Algorithm | Rigid Alignment Learning Guide
5–8 minutes -
How to Learn Wilson’s Algorithm: Loop-Erased Random Walks, Uniform Spanning Trees, Cycle Erasure and Exact Graph Sampling
7–11 minutes -
How to Learn the Savitzky–Golay Algorithm: Local Polynomial Smoothing, Derivatives, Convolution Coefficients and Signal-Preservation Trade-Offs
6–9 minutes -
How to Learn Weiszfeld’s Algorithm: Geometric Medians, Inverse-Distance Reweighting, Robust Location and Fermat–Weber Optimization
5–8 minutes -
How to Learn the Pool-Adjacent-Violators Algorithm (PAVA): Isotonic Regression, Monotone Constraints, Block Pooling and Linear-Time Fitting
5–8 minutes -
How to Learn the Bareiss Algorithm: Fraction-Free Gaussian Elimination, Exact Division, Determinants and Symbolic Linear Algebra
6–9 minutes -
How to Learn Photoacoustic Spectroscopy (PAS and QEPAS): From Light Absorption and Nonradiative Relaxation to Trace-Gas Sensing, Resonant Cells and Intelligent Multigas Analysis
5–8 minutes -
How to Learn Laser Doppler Vibrometry (LDV): From Optical Doppler Shift to Non-Contact Vibration, Modal Analysis and Full-Field Structural Dynamics
5–8 minutes -
How to Learn Off-Axis Electron Holography: From Electron-Wave Phase to Electrostatic Potentials, Magnetic Fields and Operando Nanoscale Field Mapping
5–8 minutes -
How to Learn Surface Plasmon Resonance (SPR) Biosensing: From Evanescent Fields and Resonance Shifts to Binding Kinetics, Affinity and Multiplexed Label-Free Analysis
4–7 minutes -
How to Learn Cathodoluminescence (CL) Microscopy and Spectroscopy: From Electron-Beam Excitation to Defects, Band Gaps, Plasmons and Nanoscale Light Emission
5–8 minutes -
How to Learn Time-Domain Thermoreflectance (TDTR): From Ultrafast Pump–Probe Heating to Thermal Conductivity, Heat Capacity and Interface Conductance
5–7 minutes -
How to Learn Thermogravimetric Analysis (TGA): From Mass-Loss Curves to Decomposition, Oxidation, Composition, Kinetics and Evolved-Gas Analysis
5–7 minutes -
How to Learn Broadband Dielectric Spectroscopy (BDS): From Polarization and Complex Permittivity to Molecular Relaxation, Ionic Conductivity and Glassy Dynamics
4–7 minutes -
How to Learn Dynamic Mechanical Analysis (DMA): From Oscillatory Stress and Strain to Storage Modulus, Loss Modulus, Glass Transition and Viscoelastic Master Curves
5–7 minutes -
How to Learn X-Ray Reflectivity (XRR): From Total External Reflection and Kiessig Fringes to Thin-Film Thickness, Density, Roughness and Microsecond In-Situ Metrology
5–8 minutes -
How to Learn Rutherford Backscattering Spectrometry (RBS): From Elastic Ion Scattering to Quantitative Composition, Depth Profiles and Crystal Damage Mapping
5–8 minutes -
How to Learn Electron Energy-Loss Spectroscopy (EELS): From Inelastic Electron Scattering to Chemical Bonding, Phonons, Plasmons and Atomic-Scale Spectrum Imaging
5–8 minutes -
How to Learn Raman Spectroscopy: From Inelastic Light Scattering to Molecular Vibrations, SERS, TERS and Intelligent Chemical Imaging
5–8 minutes -
How to Learn Positron Annihilation Spectroscopy (PAS): From Positron Lifetime and Doppler Broadening to Vacancy Defects, Free Volume and Depth-Resolved Materials Analysis
5–8 minutes -
How to Learn Small-Angle X-Ray Scattering (SAXS): From Scattering Vector and Guinier Analysis to Particle Size, Structure Factors and Operando Nanostructure
5–8 minutes -
How to Learn Atomic Force Microscopy (AFM): From Cantilever Forces and Feedback to Nanomechanics, Multifunctional Mapping and Autonomous AFM
5–8 minutes -
How to Learn Scanning Tunneling Microscopy and Spectroscopy (STM/STS): From Quantum Tunneling to Atomic Images, Local Density of States and Ultrafast Single-Atom Experiments
5–8 minutes -
How to Learn Nanoindentation and Instrumented Indentation: From Load–Displacement Curves to Hardness, Modulus, Size Effects and High-Resolution Mechanical Mapping
5–7 minutes -
How to Learn Mössbauer Spectroscopy: From Recoil-Free Gamma Resonance to Isomer Shift, Quadrupole Splitting, Magnetic Hyperfine Fields and Operando Iron Chemistry
5–7 minutes
Routing rule: use this fallback only for discovery and orphan control. Canonical subject ownership, reader pathways and return logic continue to come from the Learning Castle, subject hubs and Complete Archives.
