This brief paper summarizes findings from research on effective school practices that reduce violence and frequency of behavior problems. It finds that research on schools supports a comprehensive three-level approach to prevention as the most efficient and cost-effective way to reduce violence. Such an approach involves first, a schoolwide foundation that provides all students with necessary supports for learning and behavior; second, early intervention with specific students demonstrating behavior problems; and third, intensive interventions with students whose emotional and behavioral problems require it. The paper also offers guidelines for the creation of a schoolwide comprehensive violence prevention and response plan. (Contains 11 references.) (DB)