“…Many different ac tivities and skills have been trained including social skills (Bates, 1980), use of a polaroid camera (Giangreco, 1983), bus riding (Certo, Schwartz, & Brown, 1977), pedestrian skills (Page, Iwata, & Neef, 1976), clothing selection (Nutter & Reid, 1978), use of fast food restaurants (Van der Pol, Iwata, Ivancie, Page, Neef, & Whitley, 1981), making emergency telephone calls (Risely & Cuvo, 1980), and home safe ty routines (Matson, 1980). While these studies docu ment that simulating natural stimulus conditions can result in generalized performance, the measurement of generalization has often been limited to a small number of natural environments (Giangreco, 1983;Page et al, 1976;Van der Pol et al, 1981) or to a restricted number of additional simulated situations (Bates, 1980;Nutter & Reid, 1978;Risely & Cuvo, 1980;Matson, 1980). At this point it is unclear whether simulations hold sufficient instructional power to pro duce generalized performance across the range of en vironments in which the activity would normally occur.…”