“…It has often been shown, however, that performance based on an accuracy criterion is shortlived (see Johnson & Layng, 1992, 1994. On the other hand, a mastery criterion in terms of fluency that requires both high accuracy and speed has been shown to improve academic skills such as reading, spelling, mathematics, and problem solving, and to maintain those skills over a long period of tihe (Alper & White, 1971;Binder, 1988Binder, , 1996Johnson & Layng, 1992, 1996Lindsley, 1992;Potts, Eshleman, & Cooper, 1993). Because fluency training requires faster responding, it may facilitate transition from definition-based rule control to simple contingency control, and as a result, the autoclitic response may come under the stimulus control of the sentence itself and persist longer.…”