Several writers have hypothesized that college students highest in degree of congruence between their college major and their personality type tend to have the highest level of achievement, satisfaction, and stability. This study investigated congruency between college students' vocational interests and their chosen academic major as an implementation of their self-concept. College juniors and seniors (N=188) completed the Strong Campbell Interest Inventory (SCII) and the Wallace Self-Concept Scale. The dependent variable was congruence between a student's college academic major and the personality type or profile on the General Occupational Theme subscales of the SCII. Independent variables were self-concept, gender, and ethnic origin. Data analyses revealed a main effect due to the self-concept categories. There was no main effect for gender, no interaction effect of gender and self-concept, no main effect for ethnic origin, and no interaction effect of ethnic origin and self-concept on the dependent variable. Findings confirmed the hypothesis that college students with high self-concepts tended to have high congruence between vocational interest profile and selection of an academic major. Conversely, college students with low self-concepts tended to have low congruence between vocational interest profile and selection of an academic major. These results may be applied to several aspects of academic advising. (NB)