Following the final return to baseline phase, data collection was stopped and the researchers did not return to the school
for four weeks. Data on the maintenance of play skills and the reduction of stereotypy were collected at four, six, and eight
weeks for each participant. Maintenance sessions were identical to baseline sessions. A systematic play skills intervention
was not in place for the four weeks prior to the first maintenance session. The teachers were instructed to return to their
typical center time activities. The purpose of this maintenance phase was to determine if appropriate play would persist
following a period of time without ongoing play intervention.