"In summary, this study revealed marked individual differences in the ability of psychiatric patients to simulate 'normalcy' on the MMPI…. Ability to improve differed for patients in different diagnostic categories. Improvement was manifested, in many cases, by a reduction in the deviancy of the same diagnostic pattern; in other cases, by a 'diagnostic shift' to a less seriously disturbed category…. Improvability on the test appears to be a favorable prognostic indication for early hospital discharge. Some diagnostic and therapeutic implications of the double-testing approach used in this study were briefly discussed." (PsycINFO Database Record (c) 2006 APA, all rights reserved)