The play competence of young children may be fostered and developed under the mutual influences of the following major factors: the child's personal attributes, parent's attributes, physical and social environments for child's play, and human relationships such as parents' rearing attitudes and peer relations. The data on these facts were obtained through the questionnaire survey for the parents. And play competences of 2, 437 preschool children (3-6 years old) enrolled in 10 kindegartens and 9 day-care nurseries were measured by their mothers and classroom teachers who used the Play Competence evaluation scale.
HAYASI Quantification Scaling Type I was used to clarify the relationships between the play competence and these factors. The analysis disclosed that most dominant factors which foster and develop the play competence of young children were child's age, mother's attitude toward play materials, playing together with neighberhood children, and selection of playfellow.
The second aim of this article is to investigate the structure of most doiminant factor which foster the play competence. Path analysis is used for examining the causal relationships among variout variables. The four factors such as parents' living style, period of experience in preschool, play with neighberhood children, and in-door-outdoor play turned out to be more potent in fostering the play competence than any other variables.