Within the framework of a model that defined a social network as a dynamic hierarchic structure within which individuals exchange support with one another throughout their lifetime, two studies explored the development of social support networks during childhood. In the first study, 90 children in kindergarten and grades 4 and 8 at a private school were asked to rank people they knew according to how close and supportive they were to the children. In the second study, 340 children of various racial backgrounds in grades 1, 2, 4, 5, 8, and 9 ranked people they knew utilizing an examination procedure somewhat modified from the first study. Results were similar in both studies. At all ages, support was provided by family members. Older children placed more emphasis on support from friends, and placed more individuals in their support networks, than did younger children. (MDM)