The construct validity of responses to the Tennessee Self Concept Scale (TSCS) was evaluated in two sets of analyses. First, exploratory and confirmatory factor analyses, and an analysis of variance model adapted from multitrait-multimethod (MTMM) research, were used to examine the internal structure of the TSCS responses. Second, MTMM analyses were adapted to examine the convergent and discriminant validity of TSCS responses in relation to responses to the Self Description Questionnaire III and to the multidimensional self-concept ratings inferred by external observers. The subjects were 343 participants (aged from 16 to 37 years) in one of 9 Outward Bound courses offered in 1985 or 1986 at the University of Sydney (Australia). One-third of the subjects were full-time students, and most of the others were employed full-time during the year prior to the course. Across all analyses there was consistent support for TSCS family, social, and physical scales, but less consistent support for other TSCS scales. Eight tables are included and a list of 58 references is appended. (Author/TJH)