30–50 monthsNumerical PatternsShape, Space and Measure (no distinct 2021 ELG)
Orders two or three items by length or height.
Observe whether the child: orders two or three items by length or height.
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
Can sometimes identify “bigger” or “taller” between two items but ordering is inconsistent, especially with three items. Needs prompts to look closely and may confuse size words.
What you might see
Given three sticks, places them randomly and says “done” without looking back and comparing.
When asked “Which is the longest?” points to the same stick repeatedly even when a longer one is obvious.
Uses only “this one” with pointing and no comparative words when asked to order items.
Correctly picks the taller of two blocks, but cannot place three blocks in order without help.
Orders three items but swaps the middle two and does not notice the mistake.
Uses “bigger” for both longer and taller, changing words inconsistently during the task.
Expected
On track
Orders two items reliably and can order three items in familiar contexts with support (e.g., aligning ends or starting with the smallest). Begins to use comparative words like “taller” and “longer.”
What you might see
Lines up the ends of two ribbons after a reminder and says “this one is longer” correctly.
Orders three cups by height after an adult prompt to “start with the smallest.”
Uses “tall” and “short” correctly when building a tower with two or three blocks.
Exceeding
Going further
Independently orders two or three items by length or height across contexts, checking by aligning or comparing. Can explain choices simply (e.g., “this one is longer because it sticks out more”).
What you might see
Independently orders three pencils by length, adjusting placement until ends align.
Says “shortest” and “longest” while pointing to the correct items in a set of three.
Checks by placing items side by side before deciding the final order.
Creates their own ordering task (e.g., “Which spoon is longest?”) and sorts three items correctly.
Explains a method to a peer (e.g., “Put the bottoms together so you can see which is taller”).
Uses comparative series talk (e.g., “This one is longer than that but shorter than this one”).
Try this at home
Small everyday moments where you can notice this behaviour without setting up anything special.
Laundry helper: Give your child three socks (or spoons) and ask, “Can you put them in order from shortest to longest?” Notice whether they align ends to compare.
Bath towels: Offer a hand towel, bath towel, and washcloth and ask, “Which is the longest? Can you put them in order?”
Outdoor collecting: Collect three sticks and ask, “Can you line them up from shortest to longest?” Watch for checking and self-correcting.
Snack comparison: Offer three carrot sticks (or breadsticks) and ask, “Which is the longest? Put them in order.”
Construction play: Provide three block “towers” and ask, “Which is tallest? Can you order them?” Notice whether your child compares heights accurately.
Connected behaviours
Behaviours that scaffold, follow, or co-emerge with this one.
The framework source and supporting developmental research.
Framework source
Development Matters in the Early Years Foundation Stage (2012), Department for Education (DfE), Shape, Space and Measure (30–50 months) statements.
Identifies ordering by length/height as an observable early measurement behaviour suitable for assessment in everyday contexts.
Developmental research
Clements, D. H., & Sarama, J. (2009). Learning and Teaching Early Math: The Learning Trajectories Approach. Routledge.
Supports developmental progressions in early measurement (comparison, ordering, seriation), aligning rubric levels with increasing independence and generalisation.
Five-level rubric (detailed)ShowHide
The full progression underlying the three levels above. Used by the platform’s reasoning agent when planning activities and observations.
Not Yet
Does not compare length/height meaningfully and places items in random order. Shows little awareness of “longer/shorter” or “taller/shorter,” even with an adult model.
Given three sticks, places them randomly and says “done” without looking back and comparing.
When asked “Which is the longest?” points to the same stick repeatedly even when a longer one is obvious.
Uses only “this one” with pointing and no comparative words when asked to order items.
Emerging
Can sometimes identify “bigger” or “taller” between two items but ordering is inconsistent, especially with three items. Needs prompts to look closely and may confuse size words.
Correctly picks the taller of two blocks, but cannot place three blocks in order without help.
Orders three items but swaps the middle two and does not notice the mistake.
Uses “bigger” for both longer and taller, changing words inconsistently during the task.
Developing
Orders two items reliably and can order three items in familiar contexts with support (e.g., aligning ends or starting with the smallest). Begins to use comparative words like “taller” and “longer.”
Lines up the ends of two ribbons after a reminder and says “this one is longer” correctly.
Orders three cups by height after an adult prompt to “start with the smallest.”
Uses “tall” and “short” correctly when building a tower with two or three blocks.
Secure
Independently orders two or three items by length or height across contexts, checking by aligning or comparing. Can explain choices simply (e.g., “this one is longer because it sticks out more”).
Independently orders three pencils by length, adjusting placement until ends align.
Says “shortest” and “longest” while pointing to the correct items in a set of three.
Checks by placing items side by side before deciding the final order.
Reflexive
Generalises ordering skills to new materials and uses series language (shortest/middle/longest) while self-correcting. Can demonstrate a comparison method to peers and justify the order.
Creates their own ordering task (e.g., “Which spoon is longest?”) and sorts three items correctly.
Explains a method to a peer (e.g., “Put the bottoms together so you can see which is taller”).
Uses comparative series talk (e.g., “This one is longer than that but shorter than this one”).
