In an attempt to determine the subscale structures most useful for identifying adolescents with social skill deficits, this study investigated the factor structure of the Teenage Inventory of Social Skills (TISS) and its relationship to two measures of adolescent social competence. Two measures were completed by 1,142 ninth-grade students (577 males and 565 females) in 7 junior high schools: the TISS and a Sociometric and Friendship Questionnaire. Exploratory and confirmatory factor analyses, internal reliability analyses, and criterion related assessments converged to support a two-subscale structure (a prosocial and an asocial behavior subscale) of the TISS as well as provide evidence of the questionnaire's construct validity. Three tables present study data. (Author/SLD)