The Cannabis Youth Treatment (CYT) study is a multi-site randomized field experiment examining five outpatient treatment protocols for adolescents who abuse or are dependent on marijuana. The purpose of the CYT project is twofold: (a) to test the relative clinical effectiveness and cost-effectiveness of five promising interventions targeted at reducing/eliminating marijuana use and associated problems in adolescents; and (b) to provide validated models of these interventions to the treatment field. The description of the CYT project's structure includes a detailed list of study questions addressed by the study and an overview of the five experimental treatment interventions. The presentation includes discussions of the project's inclusion/exclusion criteria for the target population, research design, data sources, timeline for project and current status. The presentation concludes with an outline of the project's immediate next steps. (Contains 35 references.) (GCP)