Social Effectiveness Therapy for Children (SET-C) is a comprehensive behavioral treatment combining social skills training, peer generalization experiences, and individualized in vivo exposure for the treatment of social phobia in youth. SET-C results in positive treatment outcome and its effects are maintained at least 3 years later. In this investigation, maintenance of treatment gains 3, 4, and 5 years later was examined using a multidimensional assessment strategy consisting of self-report, parental report, clinician ratings, and direct behavioral assessment. Furthermore, the overall functioning of adolescents treated with SET-C 5 years earlier was compared with that of a group of adolescents who never suffered from psychological disorders. All posttreatment gains were maintained 5 years later, and the general functioning of SET-C treatment responders was not significantly different from those who never had a disorder. The data indicate that SET-C results in long-term positive effects for youth suffering from social phobia. (Contains 4 tables.)