Difference scores are often used as a means of assessing body image satisfaction using silhouette scales. Unfortunately, difference scores suffer from numerous potential methodological problems, including reduced reliability, ambiguity, confounded effects, untested constraints, and dimensional reduction. In this article, the methodological…

Discusses three recent studies of the validity of Rorschach test (H. Rorschach, 1921) that have not evaluated methodological issues carefully. Identifies methodological errors in each study and offers specific information for the interpretation of Rorschach results. (SLD)