Teacher-rated antisocial behavior in early elementary grades has been shown to be a precursor of adolescent delinquency and drug use. The combined effects of parent and teacher training on the teacher-rated antisocial behavior of a panel of subjects assigned to experimental and control classrooms at entry into the first grade was assessed at the end of the second grade. Lower rates of aggressiveness were found for white boys in the experimental classrooms and lower rates of self-destructive behavior were found for white girls in the experimental classrooms when compared with controls on the Teacher Form of the Child Behavior Checklist. No significant condition differences were found for black subjects. The interventions are described and limits and implications of the study are discussed.