2.2.7 - Control groups and order controls

2.2.7 The use of control groups, counterbalancing, randomisation and order effects.

Use - control groups and order controls to connect the rule to the data and decision in the question.

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

Example: apply - control groups and order controls to one small, clearly defined case, show the key step or comparison, and explain the result in words.

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