The first purpose of the present study is to observe and analyze the retarded children's interaction behavior with normal peers and nurses.The next purpose is to inquire the way how to work upon the retarded children to develop their personal interaction.The peculiarities of this study are as follows:(1)The data are got from their usual daily life situation in nursery school not from the unusual place such as an experimental room.(2)It adopts the episode sampling not the time sampling to analyze the children's behavior including the context.(3)The standard of analyses is originally made based on the retarded children's own behavior.And I try to inquire the proper way to work upon them.I reported one case of the boy that is on the borderline.As his historical age is 4 years and 1 month, his developmental level is 3 years and 6 months.He has inarticulation and slight weakness on physical exercise.The Sociometric Test shows that he is an isolated child.But it also points out he is admitted as an equal member among his class.The peculiarities of his personal interaction are as follows:(1)The interactions with peers are 61.3%, with nurses are 31.5%.The length of interactions with peers is shorter than with nurses.(2)He uses his body much more than the language to interact with persons.(3)He approaches to peers and nurses but hardly develop the interactions.(4)The interactions using language are more with nurses than with peers, because nurses understand even his inarticulate words much more than peers.(5)His positive interactions are influenced by the surrounding interactions of the other peers or peers and nurses.Based on the above data I try to inquire the way how to work upon him.1.Nurses try to bring him among peers as much as possible.2.Sometimes he needs nurses' help to play equally with peers.3.Nurses need to amend his inarticulate pronunciation.By the present study, the difficulties of the retarded child's interaction are made clear.And I can recognize his troubles concretely.

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