DEVELOPMENT OF A 3-SCALE MMPI - THE MMPI-TRI

A 60-item short form of the MMPI with very high content validity and i tems that appear on both the MMPI and MMPI-2 was developed and named t he MMPI-TRI. It contains three 20-item scales-the Subjective Distress, Acting-Out, and Psychosis scales. These three scales have excellent i nternal consistency and sufficient independence from each other. An an xiety and depression group of patients, prison inmate group, and a sch izophrenic and other psychotic group had the highest mean scores on Su bjective Distress, Acting-Out, and Psychosis, respectively. Correlatio ns with the 13 regular scales of the MMPI and MMPI-2, their content an d supplementary scales, and four other psychometric instruments provid ed very strong evidence for validity. Norms are provided.