3.3.1 - Apparatus selection

Identify the apparatus required.

Use - apparatus selection to connect the rule to the data and decision in the question.

This matters because - apparatus selection determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply - apparatus selection to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: - Apparatus selection is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.