“…In fact, there is growing evidence that PBS is undergoing a rapid extension to other populations as well. Already, the application of PBS has expanded to include people with traumatic brain injury (Singer, Glang, & Williams, 1996;Ylvisaker & Feeney, 1998), typically developing children with school discipline problems (Burke & Burke, 1999;Lewis & Sugai, 1999;Sugai et al, 2000;Warren et al, in press), and children and youth with emotional and behavioral disorders (Dunlap & Childs, 1996;Dunlap, Clarke, & Steiner, 1999;Kern, Childs, Dunlap, Clarke, & Falk, 1994). The extension of PBS represents part of a larger movement in the social sciences and education away from traditional models that have emphasized pathology and toward a new positive model that emphasizes "a science of positive subjective experience, positive individual traits, and positive institutions" (Seligman & Csikszentmihalyi, 2000b, p. 5) with a view to improving quality of life and preventing behavior problems (Seligman & Csikszentmihalyi, 2000a …”