2.2.9 - Objectivity, reliability and validity

2.2.9 Objectivity, reliability and validity (internal, predictive and ecological).

Use - objectivity, reliability and validity to connect the rule to the data and decision in the question.

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

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

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