A twin-based analysis of personality inventory scales yields information relevant to construct validity. Criteria for construct validity derived from adolescent twin statistics are illustrated with Wiggins' MMPI Content Scales. A type of discriminant validity indicates that some scales are not distinct in terms of influences of familial…

Effective psychological services require recognition of a client's strengths as well as weaknesses. Personality tests such as the MMPI, however, focus attention upon the abnormal and deviant attributes of personality. Personality evaluation should comprise positive and negative considerations of character to provide a realistic assessment of human…