Maintenance and play set preference. An assessment of maintenance was conducted 2 weeks (Mark) and 1 week (Erin) after the completion of the study. The participant was brought into one of the five room settings, presented with both play sets, and asked, “Which toy set do you want to play with?” The toy set not selected was then removed. These sessions were otherwise identical to baseline and probes in that the child was given 4 min to play with the chosen play set and no videos, prompts, or reinforcers were used.