This study evaluated the factor structure of the Rorschach Prognostic Rating Scale (RPRS) in order to: (a) test the assumption that the RPRS represents a unitary response system and (b) determine the efficacy of employing population specific factor scores as predictors of therapy outcome. (Author/NG)

All pairs of Rorschach inkblots were scaled for perceived similarity by one normal and two psychopathological samples. The resulting data were analyzed using Carroll and Chang's INDSCAL model, which resulted in a good fit in two dimensions. These were interpreted as a dimension of color and one of form ("twoness"). (Author)