A claim without reasoning is only an assertion
A student says that plants grew faster because they received more light. The class has measurements, but the groups also received different amounts of water. A claim-evidence-reasoning framework helps students separate what was observed from what the evidence can justify.
Define the claim precisely
State the proposed answer to the scientific question without exaggerating its scope.
Select relevant evidence
Use measurements and observations that directly address the claim, with appropriate units and comparisons.
Explain the scientific connection
Reasoning should show why the evidence supports the claim using relevant concepts, not merely repeat the numbers.
Consider alternative explanations
Confounding factors and measurement limitations can weaken a causal interpretation.
Use the framework flexibly
A three-part structure can support beginners, but strong scientific reasoning may require qualifications, counterarguments and additional evidence.
Assess independent understanding
Ask students to apply the framework to an unfamiliar investigation rather than copy a model answer.
Break-test: evidence contradicts the claim
Can the student revise the conclusion and explain why the original reasoning failed?
Connected knowledge
See Scientific Argumentation, Evidence Evaluation and MOE Syllabuses.