For Students 3 and 5, the off-task behavior returned to earlier rates for the final three words. Researchers have suggested that the completion of an academic task may be reinforcing {Logan & Skinner, 1998; Skinner, Robinson, Johns, Logan, & Belfiore, 1996). Perhaps these students recognized they were nearing the completion of the instructional session and, therefore, experienced reinforcement by completing the task. This effect was reduced when the data weregrouped by ARs, because the rate of off-task behavior did not return to lower levels as seen before teaching the acquisition rate.