The patterns of offending behaviour in young people (adolescents and young adults) in Australia are problematic from a number of perspectives. First, young people are over represented in official statistics. Second, serious offenders in adolescence progress on to adult crime, with a small number explaining a disproportionate number of crimes, consistent with international trends. Third, adolescent antisocial behaviour whether breaking norms or serious assaults is very common in Australian society. Fourth, police recorded trends reveal steady increases in violent offences with declines in property crimes (Australian Institute of Criminology 2006a). Fifth, antisocial behaviour whether from childhood or across all age groups is a significant economic drain on society. In light of the extent and seriousness of antisocial behaviour in our community, this report focuses on one domain of the problem, the link between types of childhood and adolescent antisocial behaviour and young adult outcomes.