This study investigated teacher and peer perceptions of aggressive behavior across grade, sex, and school type. Using student sociometric nominations and teacher ratings, perceptions of aggressive behavior were analyzed to investigate grade, sex, and school differences. African American and Latino students in third through fifth grades and their classroom teachers from two urban public schools in southern California participated in the study. The two schools differed in prevalence of violent crime in the neighborhoods surrounding the schools. It was hypothesized that older students at both schools would be perceived as less aggressive than younger students. It was also expected that students attending school in the more violent community would be perceived as more aggressive than students from the less violent neighborhood. Peer nominations for boys attending the school in the less violent community decreased dramatically across grade levels while girls remained relatively unchanged. Peer nominations for boys and girls in the more violent community remained relatively constant across grade levels. Teachers' ratings of aggression differed as a function of school type, grade, and gender. Overall, boys were perceived by teachers and peers to be considerably more aggressive than girls at both schools. Contains 23 references. (Author/SD)