“…There is a high prevalence of persons diagnosed with both a psychiatric disability and a chemical dependency in the United States, as evidenced by both epidemiological data and studies of treatment-seekers in substance abuse and mental health programs (Dixon, Haas, Weiden, Sweeney & Frances, 1991;Gawin & Kleber, 1985;Greenfield, Weiss & Tohen, 1995;Hesselbrock, Meyer & Keener, 1985;Kleinman, Miller & Millman, 1990;Marlowe et al, 1995;Mirin, Weiss & Michael, 1988;Rounseville, Anton & Carroll, 1991;Rounseville, Kosten, Weissman & Kleber, 1986;Rounseville, Weissman, Kleber & Wilber, 1982;Weiss et al, 1986). There is also evidence that those with lifetime comorbidity are more likely than those with a single disorder to experience major impairments in economic roles (e.g., unemployment, financial problems) and social roles (e.g., social isolation, interpersonal conflicts; see Kessler, 1995).…”