Assessment terms beginning with R

This is a measurement glossary, not a general HR glossary. It covers the vocabulary that appears the moment you open a score report or challenge a vendor's claim — reliability, validity, norms, cut scores, item statistics and fairness analysis — because that is the vocabulary buyers are handed without explanation and the one that decides whether a number can carry a decision.

• Reliability

  Reliability is the consistency of a measurement: how much of the variation in scores is signal rather than noise. It is reported as a coefficient between 0 and 1, and it comes in several distinct kinds — internal consistency, test–retest, parallel forms and inter-rater — which answer different questions and are not interchangeable.

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