The extent to which a test measures what it says it measures. Characteristics of Validity Validity refers to the appropriateness of the interpretation of the results, not to the test itself. Validity is not an all or nothing trait, it occurs on a continuum. No measure is valid for all purposes, validity is specific to a particular use. Validity is a unitary concept.
Validity does involve evaluative judgment.
This evidence is provided by the repeated failure to disconfirm the construct validity of a test. The extent to which a test s items actually represent the domain being tested. A representative sample of a larger domain. The extent to which a person s performance on a criterion measure can be estimated from that person s performance on the test being validated. Two types concurrent and predictive Concurrent- assessment and criterion given same time.