Based on Auerback's study of the present structures and processes of the Work Incentive (WIN) Program, the Model WIN System is a portrayal of what the program would look like if a number of suggested changes were made. Its purpose is to envision an "ideal" system within reasonable constraints and limitations. This report presents the findings and conclusions of the systems study which was based on information gathered in the review of planning and program documents and in interviews of administrators on the national, regional, state, and project site levels. The report begins with a broad concept of the WIN program and proceeds through the legislative design and management system to the resulting package of services which is delivered to the enrollee. The relationships between the underlying assumptions and the legislation, and between the legislation, the management system, and the visible package of services are traced throughout. (GB)