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Taxonomy Statistics

1,590
Topics
3,221
Prerequisites
54
Domains
183
Age Clusters

Subject Distribution

Science547 (34%)
Mathematics503 (32%)
English286 (18%)
History90 (6%)
Personal & Social Development88 (6%)
Life Skills37 (2%)
Computing21 (1%)
Learning to Learn18 (1%)

Topic Type Distribution

conceptual810 (51%)
procedural512 (32%)
meta144 (9%)
language75 (5%)
representational49 (3%)

Topics by Age

4–5
297
5–6
426
6–7
715
7–8
758
8–9
822
9–10
841
10–11
678
11–12
598

Most Central Topics

#TopicSubjectCentrality
1One-to-one countingMathematics1
2How Many in Total?Mathematics0.97
3Sitting and holding a pencilEnglish0.665
4Subtraction as taking away or separatingMathematics0.651
5Reading and writing numbers to 20Mathematics0.592
6Writing digits 0-9English0.59
7Addition as combining or putting together twoMathematics0.544
8Modern Archaeology and Egyptian EthicsHistory0.473
9Rote counting to 100Mathematics0.462
10Division as equal sharingMathematics0.431
11The teen numbersMathematics0.408
12A Ten Is Ten OnesMathematics0.406
13The two digits of a two-digit numberMathematics0.404
14Counting in 2sMathematics0.384
15Reading +, −, and = symbolsMathematics0.378

Most Connected Topics

#TopicPrereqsUnlocks
1The three digits of a three-digit number214
2Addition as combining or putting together two114
3Building sentences015
4Animals Everywhere015
5The two digits of a two-digit number212
6Counting in 2s113
7Habitats & Basic Needs86
8Inferring Characters' Feelings and Motives59
9Subordinate clauses410
10Writing Process Vocabulary012
11Multiplying fractions (age 10+)210
12How Many in Total?110
13Feeling of not understanding110
14Blending Sounds to Read Words29
15Fluent adding and subtracting within 10029

Deepest Prerequisite Chains

Topics that depend on the longest chain of prior knowledge

#TopicSubjectDepth
1Scatter Graphs & CorrelationMathematics27
2Compound UnitsMathematics26
3Comparing measurementsMathematics26
4ProportionMathematics25
5Understanding fractions (age 10+)Mathematics25
6Pictograms and tally charts (age 11+)Mathematics25
7Simultaneous EquationsMathematics25
8Ratio Notation and RelationshipsMathematics24
9Coordinates (age 12+)Mathematics24
10Efficiency, Sankey diagrams, and work doneScience24
11Scale and similar shapes (age 11+)Mathematics24
12Line graphs (age 10+)Mathematics24
13Tree diagramsMathematics24
14Percentages (age 12+)Mathematics24
15Linear Function GraphsMathematics23

Curriculum Standard Coverage

The national curriculum in England798/1117 (71%)
IB PYP Personal, Social and Physical Education (PSPE) Scope and Sequence66/138 (48%)
C3 Framework for Social Studies State Standards0/338 (0%)
Common Core State Standards for English Language Arts & Literacy in History/Social Studies, Science, and Technical Subjects493/1028 (48%)
Common Core State Standards for Mathematics187/503 (37%)
Next Generation Science Standards (NGSS) K-578/78 (100%)
Next Generation Science Standards (NGSS) Middle School34/59 (58%)
Aggregates:Average centrality: 0.073 · Average prereqs per connected topic: 2.2 · Dataset version: v1 · Generated: July 8, 2026