“…Without such practical demonstrations of workability and effectiveness, teachers are unlikely to entertain new practices (Doyle & Ponder, 1978-79, Hertzburg, 1981Lortie, 1975;Shaver, 1996). Even teachers motivated to use PBI may face dilemmas in balancing contradictory beliefs about what is desirable, necessary, and possible in their classrooms (Rossi, 1995, Rossi & Pace, 1998. Teacher beliefs about the nature and needs of adolescent learners, as well as pragmatic concerns such as large class sizes, preparation time, isolation from peers, and accountability for highstakes tests, have all been found to influence teacher choices (Cornett, 1990;Heilman, 2001;Konopak, Wilson, & Readence, 1994;Grant et al, 2002;Onosko, 1991;Saye, 1998b;Schlechty, 1993).…”