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Assessment literacy

How Personality Tests Work

Learn what reliability, validity, norms, scoring, response bias, and intended use mean before treating a result as evidence.

A polished result is not the same as evidence.

A test begins with a claim about what responses mean and what decisions the result can support. Item writing, scoring, reliability, validity, fairness, response process, and consequences all contribute to that argument. A familiar label or convincing story does not replace those steps.

Four terms worth separating.

Reliability

Whether scores show adequate consistency or stability for the intended interpretation. Reliability does not by itself prove that the intended construct is being measured.

Validity

The evidence and reasoning supporting a particular interpretation and use. It is not a permanent sticker attached to a test for every purpose.

Norms and percentiles

A comparison with a defined reference population. A 0–100 transformed display score is not automatically a percentile.

Intended use

The people, setting, purpose, and decisions for which evidence was gathered. Evidence for self-reflection would not automatically support hiring or diagnosis.

Reference