The validity of the TAT, or the degree to which it measures what it is supposed to measure,is low.[11] Jenkins has stated that “the phrase ‘validity of the TAT’ is meaningless, because validity is specific not to the pictures, but to the set of scores derived from the population, purpose, and circumstances involved in any given data collection." That is, the validity of the test would be ascertained by seeing how clinician's decisions were assisted based on the TAT. Evidence on this front suggests it is a weak guide at best. For example, one study indicated that clinicians classified individuals as clinical or non-clinical at close to chance levels (57% where 50% would be guessing) based on TAT data alone. The same study found that classifications were 88% correct based on MMPI data. Interestingly, using TAT in addition to the MMPI reduced accuracy to 80%.