High Risk Adolescents (HRA) often have complex and multiple needs contributing to their risk behaviors, and most HRA involved with multiple services were known to police prior to other service involvement. An HRA Reference Group developed a Common Assessment and Referral System to: (1) identify HRA as early as possible in their risk behaviors; (2) connect HRA to support services; and (3) increase the level of coordination between services to provide a more effective and prompt response. The target group for referrals were adolescents between 12- to 18-year-olds who were seen as at high risk because of a range of factors including mental health, substance abuse, accommodation, domestic violence, family conflict, peer issues, physical health, antisocial behavior, and a lack of supervision/support. The Common Assessment and Referral System has succeeded in all three of the project’s aims. In addition, the HRA Reference Group has provided a valid and user-friendly system for police, general practitioners, and teachers to refer adolescents into support services and has increased the opportunity for prevention work among individuals who might otherwise be left unsupported. Figures, appendix, references