In this study previously unacquainted two-year-olds formed a group structure coincident with a stabilization of social relations. The children's formation of a dominance hierarchy for object conflicts, reflected in part by an increasing group structural rigidity, was marked by a decrease in the likelihood of resistance to aggression. (Author/DB)

In a study to assess young children's social interaction with peers, six male toddlers who were the only participants in a playgroup were observed in two situations: (1) a GROUP situation in which at least four of the boys were present and (2) a DYAD situation in which only two boys were present. Both types of observations were made at 16, 19, and…