A limited set of behaviors of three-, four-, and five-year-old children were observed in a day-care program designed to permit the children a maximum of freedom for environmental encounters. The sample consists of 20 children with day-care experience dating back to infancy and a group of 20 children (a contrast group) without prior day-care experience. Two categories of observed behaviors are reported: (1) the children's use of three major activity areas, and (2) social interactions. The data indicate that differential use of the areas is a function of both prior experience and sex, and that the dating back to infancy children emit more positive social behaviors than the contrast group. Attempts to show relationships between the observed behaviors and IQ indicated no correlations. A series of 48 serial correlations were run using individual children. These analyses showed variation among the behaviors in the degree to which entering behavior influences later behavior. Serial correlation patterns were not apparently influenced by age, sex, or entering intellectual ability. (Author)