“…It is essential that the selection criteria for admission and the main treatment program remain the same (''treatment as usual''). Examples of this research strategy are the comparison of ''strict'' versus ''lenient'' contingency management (Touyz, 1998), behavioral contracts with varying degrees of minimum weight gain required (Solanto et al, 1994), day hospital programs of different lengths (Olmsted, McFarlane, Molleken, & Kaplan, 2001), body image treatment with or without confrontational procedures (Fernández & Vandereycken, 1994;Key et al, 2002), family therapy versus family group psychoeducation (Greist, Heinmaa, Stephens, Davis, & Katzman, 2000;Vanderlinden & Vandereycken, 1987), and cognitive-behavior group therapy versus a psychoeducation group (Wiseman, Sunday, Klapper, Klein, & Halmi, 2002).…”