This research study compares the efficacy of Mode Deactivation Therapy (MDT), an advanced form of Cognitive Behavioral Therapy based on Beck's theory of modes, and standard Cognitive Behavioral Therapy (CBT) for adolescent males in residential treatment. The results showed MDT was superior to CBT in reducing both physical and sexual aggression and reductions of external and internal psychological distress as measured by the Devereux Scale of Mental Disorder (DSMD) and Child Behavioral Checklist (CBCL). (Contains 5 tables and 6 figures.)