The researchers examined the effect of a classroom-based intervention on the frequency of aggression-related injuries occurring at an inclusive early education center. Aggression-related injuries involving five children decreased 79% following the intervention. Teachers implemented the procedures with fidelity. Treatment fidelity and child outcomes maintained during follow-up. Parents completed a survey developed by the researchers to measure parent perceptions of the impact of child aggression at home. Before and after results suggested that parent perceptions regarding the impact of child aggression at home declined following treatment. Teacher ratings suggested that teachers were satisfied with the usability of the procedures, the amount of work involved, and child outcomes. The researchers describe efforts to sustain a developing program.