Content validity is a test which is a representative sample of performance in some defined area of job-related knowledge, skill, ability , or other characteristic. The extent to which a test adequately samples the domain of information, knowledge, or skill that it purports to measure. Determined primarily by "Expert judgment". Most important for achievement and job sample tests
Other /More definition:
Content validity  refers to the extent to which a measure assesses all the important aspects of a phenomenon that it purports to measure

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