A 6-wk. cognitive behavioural program administered to 24 adolescent male offenders assigned to open custody and 5 to probation showed no mean differences on the Test of Nonverbal Intelligence, the Minnesota Multiphasic Personality Inventory, and the Coopersmith Self-esteem Inventory. Significant correlations were found for the personality measures with pretreatment and posttreatment scores on the Buss-Durkee Hostility Inventory.