Face validity

Face validity is the extent to which a test is subjectively viewed as covering the concept it purports to measure.

If an expert is asked instead, some people would argue that this does not measure face validity.

Face validity is a subjective measure of the extent to which this selection appears reasonable "on the face of it"—that is, subjectively to an expert after only a superficial examination of the content.

[5] Those would say that if these experts feel the model is adequate, then it has face validity.

However, in fact face validity refers to the test, not the system.