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