This study is aimed at enhancing the prosocial behaviors and the positive peer play interaction of
young children with developmental delays. Three children with developmental delays and three
students without developmental delays who were 4-year-old students in an inclusive classroom were
selected. Their homeroom teacher carried out the program with a small group of 6 children totaling
21 sessions over 3 months. The major results of this study were as follows: First, the result of both
the observer and the parents' test after the program showed that the small group made positive
changes on prosocial behaviors. In addition, the frequency of target behaviors increased during the
intervention. Second, the result of both the observer and the parents' test after the program showed
that positive peer play interaction increased in the small group. Moreover, the negative peer play
interaction such as play disturbance and play isolation decreased. In conclusion, the thematic fantasy
play program is useful for an inclusive classroom, and can be a concrete method to support inclusive
education and childcare.