Valid and reliable teacher ratings serve as the foundation for screening and assessment of youth with behavioral disorders and twin studies offer an opportunity to study those ratings. We conducted a meta-analysis of 15 empirical investigations of aggressive and rule-breaking behavior using teacher ratings in the context of a twin research design.…

Two studies evaluated effects of First Step to Success, a collaborative home and school early intervention program designed for kindergartners who show signs of emerging antisocial behavior. Two sets of 5-year-old male twins were the subjects of the 4-year studies. Exposure to the First Step program produced powerful behavior changes that were…