“…Yet the literature on the assessment of outcomes in adolescent residential treatment widely acknowledges the significant study design problems inherent in residential treatment outcome studies and the paucity of adequately designed studies (Chang et al, 996;Curry, 99;Curtis et al, 200;Gilliland-Mallo & Judd, 986;Goocher, 997;Gorske et al, 200;Hooper et al, 2000;Larzelere et al, 200;Mann-Feder, 996;Pfeiffer, 989;Pfeiffer & Strzelecki, 990;Swales & Kiehn, 995;Wilson et al, 98). These problems begin with a lack of consensus on what constitutes residential treatment (Bates et al,997;Curtis et al,200) and acknowledge that residential treatment outcome studies are inherently limited by the lack of appropriate comparison groups in the use of quasi-experimental designs (Curry,99).…”