In the Canadian context, the immediate relevance of this review is to inform both the National Crime Prevention Council and the Solicitor General of Canada of targets for prevention and early intervention that coincide with established predictors of adult criminal behaviour. [...] One hundred and twenty-eight studies met the following selection criteria: they were published within the past ten years; the research is quantitative in nature and addresses outcomes related in some way to criminogenic risk; and, the reports are sufficiently detailed to allow for an appreciation of the nature of the components of service presented. [...] Chapters One and Two address the literature related to the prediction of risk for youth to the age of eighteen. [...] By definition, this is defined as the eighteenth birthday of the participants, or the age of majority from the country of origin in which the study was conducted and the age which corresponds to entry into the adult criminal justice system. [...] The Pittsburgh Longitudinal Study, of which Loeber is the principal investigator, has been the source of much of what is known about age of onset, gender differences and the nature of initial antisocial behaviour and the long term consequences.