Numerous bureaus of mental health, drug addiction, and alcoholism are designated to provide service to persons who have discrete singular disorders of mental illness, drug addiction, or alcoholism. Mental health and substance abuse programs (nationally and internationally) have evolved with this singular limited-service capacity. Contrasting incompatible philosophies and treatment methods across the systems have resulted in minimal services for persons with dual diagnoses. The project the authors have outlined is an example of the development of a dual/multiple-disorder program that integrates these diverse systems and provides comprehensive services within each of the programs of each delivery system. These programs are cost-effective, use existing facilities, train and cross-train existing staff, correct the issues of incompatible treatment interventions, and end the dilemma of gaps in services systems and limited referral resources. As a result, the availability and quality of care for persons with dual diagnoses is greatly improved.