Principles of advanced liberal youth justice policy and practice have infiltrated several jurisdictions. Reflective of these developments, this article contends that Irish youth crime prevention and diversion policy has been dominated by three central rationalities: New Public Management, deficit-based explanations of young people’s behaviour and the prioritising of behaviourist types of interventions with young people. To illustrate this argument, the article analyses the Agenda of Change reform process of the multi-agency Garda Youth Diversion Projects. Paying close attention to the discursive nature of policy texts and associated technologies of government, it is suggested that advanced liberal discourses are productive of a distinctive field of youth justice work.