Both sets simultaneous. For Erin, when video priming resulted in low levels of scripted play actions, the video priming play set (i.e.,house) was taught using simultaneous video modeling. The procedures were identical to the Video modeling: Simultaneous condition described above. The only exception to these procedures was during sessions 117 through 128, in which preferred snacks were delivered into a cup contingent upon on-task behavior during probe sessions due to high levels of stereotypy (e.g., inappropriately throwing the ball across the room).