Many studies on play in childhood have examined only one of the three main play dimensions: play partner, type of interaction, and type of play activities. However, it seems that child's play involves various combinations these dimensions. In this study, interrelationships between dimensions, and individual diffferences in these dimensions were examined. Each of 25 preschool children was observed by two observers every ten sec.for a period of 100 seconds. Each play activity was coded in each of the above three dimensions by using a check-list. Each child was observed 8 times during an 8 week-period. Results showed that the results based on a single dimension consisted of only one special combination of the dimensions. There were also "meaningful" exceptions. The combinatorial patterns of the dimensions were changeable depending on the situational demands. However, it was also found that there were some preferences for a special type of the combinatorial pattern based on individual differences. From this result, a developmental model based on the situational changes in the combinatorial patterns and the individual differences was proposed.