I Nature of the Dual Diagnosis -- 1. The Nature and Incidence of Mental Illness in Mentally Retarded Individuals -- 2. Dual Diagnosis of Mental Retardation and Mental Illness: An Overview -- 3. Need Assessment and Service Planning for Mentally Retarded-Mentally Ill Persons -- II Treatment and Management Interventions -- 4. Use of Behavior Therapy with the Mentally Retarded in Community Settings -- 5. Modified Individual and Group Treatment Approaches for the Mentally Retarded-Mentally Ill -- 6. Specific Psychopharmacological Approaches and Rationale for Mentally Ill-Mentally Retarded Children -- 7. Treatment Strategies in the Habilitation of Severely Mentally Retarded-Mentally Ill Adolescents and Adults -- 8. Multimodal Treatment of Mental Illness in Institutionalized Mentally Retarded Persons -- III Special Systems of Services -- 9. Value-Based Programming for the Dually Diagnosed: The Rock Creek Model -- 10. A Model Inpatient Psychiatric Program: Its Relationship to a Continuum of Care for the Mentally Retarded-Mentally Ill -- 11. A Plan Designed to Deliver Services to the Multiply Mentally Handicapped -- 12. A Model Day-Treatment Service for the Mentally Retarded-Mentally Ill Population -- 13. A Home Intervention Program for Mentally Retarded-Emotionally Disturbed Individuals and Their Families -- IV Training Challenges -- 14. Training Mental Health Personnel in Mental Retardation -- 15. Teaching Behavior Modification Skills to Paraprofessionals -- 16. New Challenges in Social Work Practice with the Mentally Retarded -- V Research and Future Directions -- 17. Psychiatric Research in Mental Retardation: Current Status and Future Directions -- 18. A Broader Perspective: Applying Modern Mental-Retardation Service-System Principles to All Chronically Disabled Persons -- Author Index.