The problem of this study was a comparison of young children's intensity of task—involvement in child—selected activities. A group of 23 children, four to six years of age, was selected as the subjects from a university affiliated child development laboratory school. These children were observed during child-selected activities for five consecutive weeks. The instrument utilized to collect the data was the Intensity Of Involvement Scale, composed of seven categories of intensity from "Unoccupied" to "Complete." To obtain reliable data, two observers were involved in the observation and a carefully planned procedure of observation was followed accurately. The comparison of children's intensity of task-involvement among child-selected activities, using statistical methods of mean and standard deviation, yielded a similar result among various groups of children. The learning centers in which children were involved most intensely were water play, family living, manipulative, and art centers. The children, however, were involved in the reading, block, and writing centers less intensely. In comparing children's intensity of task-involvement between age-groups and sex-groups, the analyses of two-way t-test revealed that age-differences were significant (p<.05) but sex-differences were not significant in children's overall intensity of task-involvement. Also, the results showed that the significance of differences in children's intensity of task-involvement in each child-selected activity depended more upon the age than the sex of children. In addition, individual differences in children's intensity of task-involvement were examined using mean, frequency distribution, and range. The finding was that children differed from one another in their degrees and variability of intensity of task-involvement in child-selected activities.