In 2 multiple baseline experiments, we tested stimulus-stimulus pairing effects on acquisition of conditioned reinforcement for observing and manipulating stimuli and stereotypy/passivity. In Experiment I we studied a 5 year-old male with autism and we collected data using continuous 5-sec whole interval recording in 5 min sessions in which the student emitted appropriate play, and partial intervals of stereotypy, or passivity. Experiment 2 tested the effects of same procedure on independent work by 2 male participants with autism. The dependent variables were: intervals in which students worked independently, percentage of correct responses, and worksheet completion. Results from both experiments showed significant increases in numbers of intervals students emitted the target behaviors and decreases in stereotypy and passivity. (Contains 5 tables and 6 figures.)