Further investigation of the SI scale of the MMPI: Reliabilities, correlates, and subscale utility

First investigation of the reliabilities and correlates of the subscales of the SI scale of the MMPI. Normal college students (N = 218) were administered the SI scale and several measures typically used in social skills and assertiveness training research (i.e., an assertiveness scale, anxiety measures, social activities measure, organization questionnaire, self- and peer ratings of physical attractiveness, and peer ratings of social skills, social anxiety, and social participation). Results demonstrated acceptable reliability for the subscales of the SI scale of the MMPI and revealed that the subscales were related differentially to the measures used in this study and thus provided evidence for the utility of the subscales.