Abstract
The formation of interactions between children was studied by observing children in nursery school. The results obtained are as follows :
1) The contacts with whom they could form interactions increased in number as they grew. Imitation and behavior played an important role when they could form interactions, for those 3 years old, or speech, for those 4 years old.
2) At the stage of unfamiliarity with each other, imitation and behavior could be noticed, but as they got used to each other, speech become more effective as a means of contact.
3) Once close relations had been formed, the children were sensitive to imitation and their partner's behavior.
4) Sex difference were found; boys are more active in forming interactions. Boys have contacts more often with boys than with girls. Girls tend to come into contact with boys by means of behavior, while boys with girls by means of speech. The boys tended not to notice or react to the girl's behavior. Boys also form more complex relations (consisting of more than 3 children).
