Causal Explanation with a Boundary

Worked classroom example

Science

Worked example

“The warmer mixture reacted faster, possibly because particles collided more often. As concentration also differed, temperature alone cannot explain the result.”

Teaching sequence

1. Prepare two results from a reaction-rate investigation. Introduce causal explanation with a boundary with one clear success criterion: explain a cause using because or therefore, then include a condition or limitation that keeps the claim accurate.
2. Model one short example from a change in reaction rate. Think aloud about the language choice and the subject evidence; invite learners to test the example with a partner.
3. Learners apply the move to a new piece of Science content. Use the prompt “Which part explains the result, and which part limits the claim?” to check whether their language matches their evidence.
4. Collect one independent response. Check that the causal linker matches the evidence and that the boundary is retained. Record one next step and adjust the scaffold to what this response shows.

Try it tomorrow

Explain a cause using because or therefore, then include a condition or limitation that keeps the claim accurate.

Independent check

Check that the causal linker matches the evidence and that the boundary is retained.

Scaffold built into this activity: Some scaffold

Offer cause and qualification linkers on separate cards with an oral rehearsal first.

Teacher language

Ask learners to point to the evidence, wording or feature behind their answer. Give thinking time before inviting a revision.

Adjust the support

More support

Offer cause and qualification linkers on separate cards with an oral rehearsal first.

Greater independence

Remove the linker bank and introduce a result that contradicts the first pattern.

Use the response to choose the next step; the scaffold label describes this activity design, not the learner.