Continuity of care is a concern for mental health clients in the post deinstitutionalization era of community care. A proposed solution is systems integration. This paper reviewed research on systems integration, focusing on continuity of care outcomes. A positive association between systems integration and client continuity of care was consistently demonstrated. Better results were obtained in systems characterized by stronger management arrangements, fewer service sectors, and system wide implementation of intensive case management and centralized access to services. Future research should evaluate a wider range of systems integrating mechanisms, using client-based measures that more directly represent continuity of care experiences. (Authors)