“…Treatments have been selected for consideration partly on the basis of having been little discussed from an EO perspective. Thus, noncontingent reinforcement, the effectiveness of which has been interpreted as at least partly the result of the modification of EOs (Hagopian et al, 1994;Marcus & Vollmer, 1996;Vollmer et al, 1993Vollmer et al, , 1995Wilder & Carr, 1998), has not been considered. It should be noted that, in routine clinical practice, treatment procedures are often combined into a multicomponent treatment package (Carr, Robinson, Taylor, & Carlson, 1990;LaVigna, Willis, & Donellan, 1989;Meyer & Evans, 1989) in which they may interact in complex ways.…”