Innovative Approaches for Difficult-to-Treat Populations makes recommendations for developing and disseminating innovative mental health services. It is geared toward clinicians, administrators, and policy-makers struggling to develop both clinically effective and cost-effective mental health and substance abuse services, and it focuses on services for individuals who use the highest proportion of mental health resources and for whom traditional services have not been effective. These target populations include youth with serious behavioral and emotional disturbances and adults with severe and persistent mental illnesses. The innovative approaches reviewed include diverse treatment methods for differing clinical populations. These varied approaches have several common elements: * Social-ecological theory frameworks* An emphasis on delivering flexible, comprehensive, pragmatic, and goal-oriented interventions in persons' natural environments* Increased accountability on the part of service providers* The transition from centralized to community-based care is discussed, and normalizing a patient's daily routine as an important factor in the success of state-of-the-art community support programs is emphasized Innovative Approaches for Difficult-to-Treat Populations offers mental health professionals and students a firsthand look at the future direction of clinical services. Policy issues necessary to developing and disseminating progressive treatments are addressed, including the downsizing of state psychiatric hospitals, strategies for reforming state mental hospital systems, and ethical issues in research on child and adolescent mental disorders.