“…Generally, behavior problems can be separated into behavioral excesses, wherein the occurrence of the behavior constitutes the problem (eg disruptive vocalization and physical aggression; Burgio, , 1997Cohen-Mans®eld et al, 1989), and behavioral de®cits, wherein the non-occurrence of the behavior is problematic (eg cessation of selfdressing or social interaction; Burgio and Bourgeois, 1992;Burgio et al, 1996a;Rubin et al, 1987). Following the behavioral environmental model, behavior problems may be precipitated by internal or external stimuli, their expression may vary diurnally (Cohen-Mans®eld and Werner, 1994), and dierent problem behaviors may manifest at dierent points within the disease process (Bourgeois, 1991;Jackson et al, 1997).…”