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16–26 monthsNumerical Patterns

Beginning to categorise objects according to properties such as shape or size.

Observe whether the child: beginning to categorise objects according to properties such as shape or size.

What it looks like

Three ways this behaviour shows up as a child grows. Each level includes everyday moments to watch for.

Emerging

Just starting

Occasionally matches two items that look alike when prompted, but groupings break down quickly or the child changes criteria mid-way.

What you might see

  • Given a pile of mixed blocks, child puts random pieces into containers without repeating any grouping rule.
  • When adult says ‘put the big ones here’ child continues placing small ones in the same place.
  • When adult hands two circles and asks ‘same?’ child places them together once but then mixes shapes again.
  • Sorts two large items together but then adds smaller items to the same group without checking size.

Expected

On track

Can sort a small mixed set into two groups by one obvious property (all big vs small, or round vs not round) with adult support in familiar play.

What you might see

  • With six items (3 big, 3 small), child puts most big items in one pile and most small in another after the adult models the first one.
  • When asked for ‘the round ones’ child picks out two obvious round items from a small set, missing another round item.

Exceeding

Going further

Independently categorises objects by one property and keeps the rule across several items; can re-sort by a new property when asked.

What you might see

  • Independently makes a ‘big’ pile and a ‘small’ pile with a set of toys and keeps adding according to size.
  • When adult asks to ‘sort by shape instead’ child re-sorts into a ‘round’ group and a ‘not round’ group.
  • Notices a misplaced item and moves it to the correct group without prompting.
  • When offered a new item, child places it in the correct group immediately and states a simple rule (e.g., ‘big here’).

Try this at home

Small everyday moments where you can notice this behaviour without setting up anything special.

  • At tidy-up, offer two baskets and say ‘Can you put the big blocks in this one and the small blocks in that one?’ Watch whether your child keeps the rule.

  • During bath, give a few cups/containers of different sizes and ask ‘Which ones are the same size?’ Notice whether your child groups them.

  • At snack, give a mix of round and long foods and ask ‘Can you put the round ones together?’

  • In outdoor play, collect leaves/stones and ask ‘Can you make a pile of the big ones and a pile of the small ones?’

Connected behaviours

Behaviours that scaffold, follow, or co-emerge with this one.

Where this comes from

The framework source and supporting developmental research.

Framework source

  • Development Matters in the Early Years Foundation Stage (EYFS) (DfE, 2012), Shape, Space and Measure.

    DM2012 frames early categorisation by observable properties (shape/size) as a developmental step in mathematical thinking.

Developmental research

  • Piaget, J. (1952). The Origins of Intelligence in Children. New York: International Universities Press.

    Classic developmental theory links early concept formation and classification to children's active manipulation and comparison of objects.

Five-level rubric (detailed)Show

The full progression underlying the three levels above. Used by the platform’s reasoning agent when planning activities and observations.

Not Yet
Plays with objects but does not group them by a shared property (shape/size); sorting is random or based only on immediate interest.
  • Given a pile of mixed blocks, child puts random pieces into containers without repeating any grouping rule.
  • When adult says ‘put the big ones here’ child continues placing small ones in the same place.
Emerging
Occasionally matches two items that look alike when prompted, but groupings break down quickly or the child changes criteria mid-way.
  • When adult hands two circles and asks ‘same?’ child places them together once but then mixes shapes again.
  • Sorts two large items together but then adds smaller items to the same group without checking size.
Developing
Can sort a small mixed set into two groups by one obvious property (all big vs small, or round vs not round) with adult support in familiar play.
  • With six items (3 big, 3 small), child puts most big items in one pile and most small in another after the adult models the first one.
  • When asked for ‘the round ones’ child picks out two obvious round items from a small set, missing another round item.
Secure
Independently categorises objects by one property and keeps the rule across several items; can re-sort by a new property when asked.
  • Independently makes a ‘big’ pile and a ‘small’ pile with a set of toys and keeps adding according to size.
  • When adult asks to ‘sort by shape instead’ child re-sorts into a ‘round’ group and a ‘not round’ group.
Reflexive
Explains their grouping rule in simple terms and flexibly categorises across contexts, noticing and repairing mis-sorts.
  • Notices a misplaced item and moves it to the correct group without prompting.
  • When offered a new item, child places it in the correct group immediately and states a simple rule (e.g., ‘big here’).