Test Validity

Test validity is the extent to which a test (such as a chemical, physical, or scholastic test) accurately measures what it purports to measure. In the fields of psychological testing and educational testing, “Validity refers to the degree to which evidence and theory support the interpretations of test scores entailed by proposed uses of tests.” Although classical models divided the concept into various "validities" (such as content validity, criterion validity, and construct validity), the currently dominant view is that validity is a single unitary construct.
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