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 1–3 English Independent Learning Foundations | Retrieval, Spacing, Error Return, Transfer and Study Planning
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Primary 1–3 English Syllabus and Progression | From Foundations to Independent Language Use
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Primary 1–3 Grammar Foundations | How Sentence Meaning, Tense, Reference and Cohesion Develop
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Primary 1–3 Listening and Oral Communication Foundations | Attention, Meaning, Discussion, Presentation and Spoken Response
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Primary 1–3 Reading Comprehension Foundations | Fluency, Meaning, Inference, Evidence and Transfer
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Primary 1–3 Vocabulary and Spelling | Word Meaning, Word Families, Retrieval and Accurate Use
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Primary 1–3 Writing Foundations | From Sentences to Paragraphs, Purpose, Voice, Revision and Independent Control
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Primary 2 Discovery Science Sengkang | From Observation to Explanation
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Primary 2 Discovery Science Sengkang | Observe, Classify & Explain
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Primary 2 English Learning Guide | Character Motivation, Feelings, Actions and Response: Evidence and Change
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Primary 2 English Learning Guide | Character, Speaker and Author Viewpoint: Perspective, Voice, Knowledge, Purpose and Evidence
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Primary 2 English Learning Guide | Collaborative Discussion: Turn-Taking, Clarification, Building on Ideas and Respectful Disagreement
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Primary 2 English Learning Guide | Comparing Two Texts: Similarities, Differences, Purpose and Evidence
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Primary 2 English Learning Guide | Comprehension Cloze: Cohesion, Context and Whole-Text Meaning
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Primary 2 English Learning Guide | Comprehension Question Types and Answer Precision
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Primary 2 English Learning Guide | Consolidation and the Primary 3 Handover
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Primary 2 English Learning Guide | Countable and Uncountable Nouns Workshop: Quantifiers, Measure Words and Precise Meaning
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Primary 2 English Learning Guide | Descriptive Writing: Observation, Sensory Detail, Precise Nouns, Verbs and Comparison
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Primary 2 English Learning Guide | Dialogue and Punctuation: Speech, Reporting Clauses, Voice and Meaning
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Primary 2 English Learning Guide | Email and Digital Message Writing: Purpose, Audience, Subject, Tone and Complete Information
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Primary 2 English Learning Guide | Error Analysis, Self-Correction, Retrieval and Transfer
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Primary 2 English Learning Guide | Explanatory Writing: How, Why, Cause, Process and Precision
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Primary 2 English Learning Guide | Fact, Opinion, Inference and Evidence
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Primary 2 English Learning Guide | Figurative and Idiomatic Meaning in Context: Simile, Personification, Simple Idioms and Comparison
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Primary 2 English Learning Guide | Grammar and Editing: Agreement, Tense, Pronouns, Connectors and Sentence Boundaries
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Primary 2 English Learning Guide | Growing Independence and the Primary 3 Bridge
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Primary 2 English Learning Guide | Independent Reading: Book Choice, Response and Building a Reading Life
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Primary 2 English Learning Guide | Independent Study Routines for English: Retrieval, Spacing, Error Return, Transfer and Planning
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Primary 2 English Learning Guide | Information Synthesis Across Text and Visual Sources: Main Idea, Evidence and Integration
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Primary 2 English Learning Guide | Informational and Functional Writing: Purpose, Audience, Notes, Messages and Instructions
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Primary 2 English Learning Guide | Listening Comprehension: Main Ideas, Details, Sequence and Change
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Primary 2 English Learning Guide | Modal Verbs: Ability, Permission, Advice, Obligation and Certainty
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Primary 2 English Learning Guide | Narrative Writing: Character, Choice, Consequence and Pacing
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Primary 2 English Learning Guide | Nonfiction and Informational Reading: Main Idea, Structure, Comparison and Evidence
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Primary 2 English Learning Guide | Opinion Writing: Claim, Reasons, Examples, Audience and Revision
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Primary 2 English Learning Guide | Oral Communication: Reading Aloud, Conversation, Idea Development and Recovery
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Primary 2 English Learning Guide | Parts of Speech in Context: Nouns, Verbs, Adjectives, Adverbs and Prepositions
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Primary 2 English Learning Guide | Personal Recount Writing: Chronology, Significant Moments, Reflection and Voice
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Primary 2 English Learning Guide | Phrasal Verbs and Common Multi-Word Expressions: Context, Collocation and Meaning
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Primary 2 English Learning Guide | Poetry and Literary Language: Imagery, Sound, Character, Theme and Response
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Primary 2 English Learning Guide | Prepositions Workshop: Time, Place, Movement and Precise Instructions
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Primary 2 English Learning Guide | Presentation Skills: Planning, Signposting, Voice, Visuals, Questions and Recovery
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Primary 2 English Learning Guide | Procedural Writing: Goal, Materials, Sequence, Conditions and Testing
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Primary 2 English Learning Guide | Pronouns, Articles and Reference Chains: Clarity, Cohesion and Meaning
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Primary 2 English Learning Guide | Question Generation and Metacognitive Reading: Prediction, Monitoring and Repair
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Primary 2 English Learning Guide | Questions and Negatives Workshop: Do, Does, Did, Be and Meaning-Preserving Rewrites
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Primary 2 English Learning Guide | Reading Fluency, Phrasing, Silent Reading Stamina and Strategic Rereading
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Primary 2 English Learning Guide | Reading Multi-Step Instructions and Task Language: Sequence, Conditions, Constraints and Checking
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Primary 2 English Learning Guide | Reading Tables, Charts, Timetables and Maps: Labels, Units, Comparison and Evidence
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Primary 2 English Learning Guide | Reading, Comprehension and Meaning
Browse every published Post
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PSLE Science Reality Lab Vol No.544 | “Overall AQI = 160” — Is That the Average Pollution Score Across All Pollutants?
13–20 minutes -
PSLE Science Reality Lab Vol No.550 | “Accessioned in 1985” — Was the Specimen Collected in 1985?
17–25 minutes -
PSLE Science Reality Lab Vol No.549 | “Control = 1.0; Treatment = 1.4” — Were Those the Raw Measurements?
11–16 minutes -
PSLE Science Reality Lab Vol No.548 | “Pipette Set to 100 µL” — Did It Deliver Exactly 100.000 µL?
12–18 minutes -
PSLE Science Reality Lab Vol No.547 | “Tare = 0.000 kg” — Does That Mean the Empty Container Has No Mass?
10–16 minutes -
PSLE Science Reality Lab Vol No.543 | “LiDAR Point Density = 8 points/m²” — Does Every Square Metre Contain Exactly Eight Points?
13–19 minutes -
PSLE Science Reality Lab Vol No.542 | “Filter Capacity = 1,000 Gallons” — Does It Work Perfectly Until Gallon 1,000 and Fail at 1,001?
11–17 minutes -
PSLE Science Reality Lab Vol No.541 | “Ventilation Fan = 100 CFM” — Will It Move 100 CFM After Any Installation?
12–17 minutes -
PSLE Science Reality Lab Vol No.540 | “Pixel Value = 12,000 DN” — Is That Already a Physical Reflectance Measurement?
15–22 minutes -
PSLE Science Reality Lab Vol No.538 | “Absorbance = 2.0” — Did the Sample Absorb Twice as Much Light as Absorbance = 1.0?
15–22 minutes -
PSLE Science Reality Lab Vol No.537 | “This Museum Dinosaur Is One Skeleton” — Did Every Display Bone Come From One Animal?
15–23 minutes -
PSLE Science Reality Lab Vol No.536 | “Least Concern” — Does That Mean a Species Has No Conservation Problems?
12–19 minutes -
PSLE Science Reality Lab Vol No.535 | “AUC = 0.90” — Is the Classifier 90% Accurate?
14–21 minutes -
Top 10 Value-of-Information Skills Worth Learning
11–16 minutes -
Top 10 Decision Threshold Skills Worth Learning
10–15 minutes -
Top 10 Diagnostic Reasoning Skills Worth Learning
10–14 minutes -
Top 10 Counterexample Reasoning Skills Worth Learning
10–15 minutes -
PSLE Science Reality Lab Vol No.539 | “Result: R — Rejected” — Does That Mean the Substance Was Not There?
19–28 minutes -
Top 10 Reliability Reasoning Skills Worth Learning
11–17 minutes -
Top 10 Optimization Skills Worth Learning
10–15 minutes -
Top 10 Risk Reasoning Skills Worth Learning
9–14 minutes -
Top 10 Evidence Weighting Skills Worth Learning
11–17 minutes -
PSLE Science Reality Lab Vol No.534 | “Six Check Results Keep Rising but Stay Inside the Limits” — Can We Ignore the Trend?
10–15 minutes -
PSLE Science Reality Lab Vol No.533 | “Proficiency-Test z-Score = 0.2” — Is the Laboratory 99.8% Accurate?
9–13 minutes -
PSLE Science Reality Lab Vol No.532 | “Water-Quality Geometric Mean = 40” — Were Most Samples About 40?
10–15 minutes -
PSLE Science Reality Lab Vol No.531 | “The Radar Map Is Blank in This Wedge” — Does That Mean No Rain Fell There?
12–18 minutes -
PSLE Science Reality Lab Vol No.528 | “Slope = 100%” — Does 100% Mean a Vertical Cliff?
9–14 minutes -
PSLE Science Reality Lab Vol No.527 | “The Change Map Shows a Red Edge” — Did the Ground Really Change, or Were the Images Slightly Misaligned?
13–19 minutes -
PSLE Science Reality Lab Vol No.526 | “The Line Connects the Measurements” — Was the Value Measured at Every Moment Between the Dots?
10–14 minutes -
PSLE Science Reality Lab Vol No.525 | “Result Above Calibration Range” — Can We Trust the Exact Concentration?
10–15 minutes -
PSLE Science Reality Lab Vol No.524 | “This Scatter Plot Shows 80 Visible Dots” — Were There Only 80 Measurements?
10–16 minutes -
Top 10 Debugging Skills Worth Learning
12–17 minutes -
PSLE Science Reality Lab Vol No.523 | “Sample Receipt Temperature = 4°C” — Was the Sample Kept at 4°C for the Whole Journey?
11–17 minutes -
Top 10 Scenario Reasoning Skills Worth Learning
12–18 minutes -
Top 10 Sensitivity Analysis Skills Worth Learning
12–18 minutes -
Top 10 Robustness Skills Worth Learning
13–20 minutes -
PSLE Science Reality Lab Vol No.522 | “Cited 1,000 Times” — Does That Mean a Scientific Paper Was Confirmed 1,000 Times?
13–20 minutes -
PSLE Science Reality Lab Vol No.521 | “This Histogram Has Two Peaks” — Does That Prove the Measurements Form Two Natural Groups?
13–20 minutes -
PSLE Science Reality Lab Vol No.520 | “Weather Model Grid Spacing = 1 km” — Is the Forecast Accurate to Within 1 km?
12–19 minutes -
PSLE Science Reality Lab Vol No.519 | “This Species Map Shows a Point Here” — Was the Organism Observed at That Exact Public Location?
13–19 minutes -
PSLE Science Reality Lab Vol No.518 | “Satellite Revisit Time = 5 Days” — Will There Be a Usable Image Every Five Days?
13–19 minutes -
Top 10 Ethical Reasoning Skills Worth Learning
15–23 minutes -
Top 10 Visual Literacy Skills Worth Learning
14–21 minutes -
PSLE Science Reality Lab Vol No.517 | “Laboratory Control Sample: PASS” — Does That Prove the Real Sample Had No Matrix Interference?
10–15 minutes -
Top 10 Constraint Reasoning Skills Worth Learning
14–21 minutes -
Top 10 Scale Reasoning Skills Worth Learning
15–22 minutes -
PSLE Science Reality Lab Vol No.516 | “This LiDAR Intensity Patch Is Bright” — Is the Ground Higher or Naturally Brighter?
10–16 minutes -
PSLE Science Reality Lab Vol No.515 | “This Seafloor Patch Is Bright on the Sonar Map” — Is It Shallower Water?
10–15 minutes -
PSLE Science Reality Lab Vol No.514 | “The Cloud Is Directly Above This Spot” — Could Satellite Parallax Shift Its Apparent Position?
11–17 minutes -
PSLE Science Reality Lab Vol No.513 | “This Water Is Brilliantly Bright in the Satellite Image” — Is Something Bright Floating on the Surface?
12–18 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.
