“…Locus of control would appear to be an important factor that affects treatment outcome for several groups, including sex offenders (Fisher et al, 1998), drug users (Dekel et al, 2004), and adolescent offenders (Page & Scalora, 2004). People with intellectual disabilities appear to generally endorse an external locus of control (Gardner, Warren & Gardner, 1977;Koscielak, 1988;Riedel & Milgram, 1970;Wehmeyer, 1994;Wehmeyer & Palmer, 1997), and this subsequently raises questions about how locus of control is related to treatment outcome for offenders with intellectual disabilities.…”