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Face validity

A measure is doing something that resembles what it should be doing

Face validity is the weakest form of validity evidence. It means that at "face value," an instrument does what it is supposed to do. The instrument may have a catchy name that denotes what it is supposed to do, or it may have items that are written to cover a certain content area, but there is no psychometric evidence related to its reliability and validity.

Essentially, it means that the survey appears to measure what it is supposed to measure, without any empirical evidence to back up that it does what it is supposed to do. This is not an acceptable form of validity evidence. There is no calculation for face validity, as it is purely subjective.

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