This study involved 30 children with attention deficit disorder with hyperactivity (ADD+H), 14 children with attention deficit disorder without hyperactivity (ADD-H), and 28 clinic control children, with a mean age of 8.1 years, and utilized an extreme groups methodology. The study tested the hypothesis that the teacher-rated social behavior of ADD-H children would be characterized by social withdrawal and the ADD+H children by aggression. The hypothesis was confirmed, and the study concluded that this finding underlines the potential utility of separation of these two groups on the overactive dimension. (Contains 12 references.) (JDD)