This document reports the results of a follow-up of a longitudinal, comparative study of Swedish children reared in center and home settings that are especially pertinent to the debate about the long-term effects of care on social development. The study began with a sample of 120 children from 12-18 months of age. Sixty infants were enrolled in high-quality, municipally-operated day care centers, and 60 were cared for at home. Infants were observed with their caregivers in an effort to gain a detailed picture of the social dimensions of life in homes and centers. When the children were 5 years old, 102 of them were studied again. This study focused on the children's interactions with peers and adults in the two care settings. In the next follow-up study, 52 of the original 120 subjects were studied at the age of 10 years. Of the 52 children, 26 were specified as receiving continuous center care and 26 as receiving care in homes. The findings of the earlier phases of the study revealed group differences in the social experiences of the 1- and 5-year-olds in home and center settings. By middle childhood, individual differences in the direction and pace of children's development were overtaking and obscuring the effects of early care arrangements. No evidence was found that the children from center backgrounds demonstrated more negative or aggressive behavior with peers or adults than did children with home care. (RH)