Improving Service Delivery for Individuals with Co-Occurring Disorders

New Perspectives on the Quadrant Model

Published In: Psychiatric Services, v. 59, no. 11, Nov. 2008, p. 1251-1253

Posted on RAND.org on December 31, 2007

by Donna J. Keyser, Katherine E. Watkins, Anna-Marie Vilamovska, Harold Alan Pincus

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This column summarizes findings of a study that examined the usefulness of the quadrant model for improving service delivery for persons with co-occurring disorders. The authors discuss treatment recommendations, goals and barriers related to delivering care, policy recommendations for implementing evidence-based interventions, and strengths and limitations of the model. They conclude that although the quadrant model is useful for conceptualizing systems-level factors for improving delivery, its further development is unlikely to result in improved care at the clinical level. They call for research to develop and implement evidence-based practices targeted to specific populations of persons with co-occurring disorders.

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