a subjective impression, usually on the part of examinees, of the extent to which the test and its format fulfills the intended purpose of measurement; does the test appear to measure what it claims to measure.
A form of validity of a questionnaire or construct, that is not the direct result of a statisical analysis, but one that is a qualitative judgement made by examining the contents of the questions with reference to what is known about the construct from research. The face validity of a measure of anti-social personality disorder, for example, could be assessed by comparing the set of questions against what is known about the disorder from research, and especially case studies.
Face validity is a property of a test intended to measure something. The test is said to have face validity if it "looks like" it is going to measure what it is supposed to measure.http://www.chssc.salford.ac.uk/healthSci/resmeth2000/resmeth/validity.htm For instance, if you prepare a test to measure whether students can perform multiplication, and the people you show it to all agree that it looks like a good test of multiplication ability, you have shown the face validity of your test.