reliability is the extent to which a test measures what it is intended to measure
When this is the case, there is no justification for using thetest results for their intended purpose. There are several ways to estimate the validity ofa test including content validity, concurrent validity, and predictive validity. The facevalidity of a test is sometimes also mentioned. 2. Reliability Reliability is one of the most important elements of test quality. It has to do with theconsistency, or reproducibility, or an examinee's performance on the test.