School shootings are tragic, but parents, students, and school staff can take steps to prevent them, researchers report. A pair of researchers on school violence share three strategies that have been proven to prevent school shootings. These types of interventions are known to prevent school violence. The National Policing Institute is a nonprofit organization based in Arlington, Virginia, that maintains the Averted School Violence Database. These lessons have been used to improve the violence prevention strategies for threat assessment, information sharing, and leadership in school settings.