Be critical

Only reliable measurement methods provide trustworthy evidence

Whether a claim is trustworthy depends on how the evidence for that claim was obtained and measured

In general, the measurement of direct/objective outcomes (e.g. production errors, staff turnover rate) is more likely to be valid and reliable than that of self-report/subjective outcomes (e.g. trust among team members, stress).

In addition, when the evidence comes from scientific research that uses a questionnaire, check if it was also used in other studies. If it was ‘self-made’ it is less likely to be valid and reliable.

BEWARE

Always ask: how was the outcome/effect measured (and is that a reliable way to measure)?