The purpose of this study is to analyzes social interaction of an autistic infant and his peers in inclusion preschool childcare and examines the roles and the activities of kindergarten teachers ...concerned with social interaction. The objects are a 5-year-old is the pervasive developmental disorder and his peers in his class. The observation was performed from April, 2009 to March, 2010. During the time , there rose the infant's interaction with his peers and later relation with his other friends . Probable factors were, 1) kindergarten teachers accepted the infant, and 2) his peers urged their classmates to recognize him. What caused good results seemed to be that the kindergarten teachers introduced the infant's favorite playthings into the corner activities and structured their childcare activities, in order to promote his interaction with his peers.
