This paper presents a developmental and a clinical model for the treatment of conduct disorder through the strategy of preventive intervention. The theoretical principles and clinical strategies utilized in the FAST Track (Families and Schools Together) Program are described. We indicate how the clinical model is derived from both our developmental model and previous findings from prevention trials. The FAST Track Program integrates five intervention components designed to promote competence in the family, child, and school and thus prevent conduct problems, poor social relations, and school failure. It is our belief that testing the effects of such a comprehensive approach is a necessary step in developing new intervention models for this population. © 1992, Cambridge University Press. All rights reserved.