Test validity- the accuracy with which a test, interview, and so on measures what it purports to measure or fulfills the function it was designed to fill.
Test validity answers the question “Does this test measure what it’s supposed to measure? Put another way, validity refers to the correctness of the inferences that can make based on the test. For example, if Jane gets a higher score on mechanical comprehension tests than Jim does, it can be sure that Jane possesses more mechanical comprehension than Jim does.