This study explored the impact of a 4-week skills group intervention based on the principles of DBT with a sample of adolescents attending a DAEP. This program will provide a session-by-session overview of activities addressing DBT specified training modules of mindfulness, emotional regulation, interpersonal effectiveness, and distress tolerance. The results of a pre/posttest comparison will be presented. Implications and continuing challenges of conducting efficacy studies of clinical interventions in schools will be discussed.