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30–50 monthsThe Natural World

Talks about why things happen and how things work.

Observe whether the child: talks about why things happen and how things work.

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

The child attempts simple explanations, often echoing adult phrases or using because without a clear link to cause. Explanations are inconsistent and usually need adult prompting.

What you might see

  • When asked why something happened (for example, the tower fell), responds with a shrug, silence, or a single word not linked to cause.
  • Watches a simple mechanism (for example, a pop-up toy) but does not comment on how it works.
  • Names objects (for example, car, rain) without adding any explanation even after an adult model.
  • Says a short explanation after hearing an adult model (for example, It fell because... ) but cannot finish the idea without help.
  • Uses because in a way that does not match the event (for example, It is wet because dog).
  • Repeats an adult explanation word-for-word during the same activity but does not use it later.

Expected

On track

The child gives simple cause-and-effect talk about familiar events and objects, especially when an adult asks why or how. They can link an action to an outcome in everyday situations.

What you might see

  • Explains a familiar outcome with a simple cause (for example, It is dark because the light is off).
  • Describes how to make a toy work in one step (for example, Press here to make it go).
  • Uses short process talk during play (for example, Pour it in and it fills up).

Exceeding

Going further

The child spontaneously talks about why things happen and how things work across several contexts, using plausible explanations and asking follow-up questions. They can describe a simple process with two or more steps.

What you might see

  • Asks why questions during routines (for example, Why is the kettle making noise?).
  • Explains a simple sequence with two steps (for example, We turn the tap and water comes out).
  • Notices and comments on physical effects (for example, The ice melted because it is warm).
  • Makes a prediction and checks it (for example, If I push harder it will go faster) during play.
  • Changes an explanation after new evidence (for example, It did not float because it is heavy).
  • Explains to another child what they think will happen and why during joint play.

Try this at home

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

  • During cooking, pick a simple change (for example, butter melting or toast browning) and ask, Why is it changing? Notice whether your child offers any cause-and-effect talk.

  • In the bath, play with objects that float and sink and ask, How can we make it float? Observe whether your child suggests or tests ideas.

  • Outdoors, notice wind, rain, or shadows and ask, Why is it moving? or How did that happen? Listen for any explanation attempt.

  • During block or marble-run play, ask, How can we make it stay up? or Why did it fall? Notice whether your child links actions to outcomes.

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 EYFS (DfE, 2012) - Understanding the World: The World (30-50 months).

    DM2012 identifies explanatory talk about causes and mechanisms as a progression marker in understanding the world.

Developmental research

  • Gopnik, A., Meltzoff, A. N., & Kuhl, P. K. (1999). The Scientist in the Crib: Minds, Brains, and How Children Learn.

    Summarises evidence that young children build causal understanding through everyday observation, talk, and play-based testing of ideas.

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
The child does not yet talk about causes or mechanisms and rarely offers any explanation for events, even with prompts. Talk stays at naming or describing without linking to why or how.
  • When asked why something happened (for example, the tower fell), responds with a shrug, silence, or a single word not linked to cause.
  • Watches a simple mechanism (for example, a pop-up toy) but does not comment on how it works.
  • Names objects (for example, car, rain) without adding any explanation even after an adult model.
Emerging
The child attempts simple explanations, often echoing adult phrases or using because without a clear link to cause. Explanations are inconsistent and usually need adult prompting.
  • Says a short explanation after hearing an adult model (for example, It fell because... ) but cannot finish the idea without help.
  • Uses because in a way that does not match the event (for example, It is wet because dog).
  • Repeats an adult explanation word-for-word during the same activity but does not use it later.
Developing
The child gives simple cause-and-effect talk about familiar events and objects, especially when an adult asks why or how. They can link an action to an outcome in everyday situations.
  • Explains a familiar outcome with a simple cause (for example, It is dark because the light is off).
  • Describes how to make a toy work in one step (for example, Press here to make it go).
  • Uses short process talk during play (for example, Pour it in and it fills up).
Secure
The child spontaneously talks about why things happen and how things work across several contexts, using plausible explanations and asking follow-up questions. They can describe a simple process with two or more steps.
  • Asks why questions during routines (for example, Why is the kettle making noise?).
  • Explains a simple sequence with two steps (for example, We turn the tap and water comes out).
  • Notices and comments on physical effects (for example, The ice melted because it is warm).
Reflexive
The child generates and tests simple ideas (for example, if we do X then Y will happen) and updates their explanation based on what they see. They can explain their thinking to another child and use explanatory talk during play and problem solving.
  • Makes a prediction and checks it (for example, If I push harder it will go faster) during play.
  • Changes an explanation after new evidence (for example, It did not float because it is heavy).
  • Explains to another child what they think will happen and why during joint play.