3.5.3 - Correct units

Use correct units throughout data processing.

Use - correct units to connect the rule to the data and decision in the question.

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

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

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