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Cognitive-behavioral therapy. Treating individuals with dual diagnoses.

Because deinstitutionalization of individuals with mental retardation/developmental disability and mental illness has become the standard of practice, many practitioners are now faced with the challenge of serving the needs of this specialized population. The existence of mental illness in individuals with mental retardation has been well established in the literature, but there are relatively few studies involving therapeutic interventions in this client population. However, there is a theoretical framework that guides practice and measures the effectiveness of interventions with this specialized population. This article presents a case study exploring the application of cognitive-behavioral therapy to a client with mental retardation and mental illness. The theoretical framework, major concepts, and key assumptions of the theory will be reviewed, as well as treatment outcomes.