Assessment terms beginning with V

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.

• Validity

  Validity is not a property of a test. It is the degree to which evidence and theory support the interpretations made of test scores for a specific proposed use. The same instrument can be valid for one decision and invalid for another, so validity is always stated in relation to a purpose.

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