The American public has expressed increasing alarm over incidents of multiple casualty violence. While the law enforcement community has progressed in advancing training in the tactical response to incidents, there are significant gaps in strategies aimed at preventing multiple casualty violence. To address this need, the U.S. Department of Homeland Security’s Federal Law Enforcement Training Center collaborated with the U.S. Department of Justice’s Office of Community Oriented Policing Services and the Johns Hopkins University’s School of Education, Division of Public Safety Leadership, to facilitate the National Summit on Multiple Casualty Shootings. The summit planners invited subject-matters experts from a wide range of disciplines, such as law enforcement, health care, law, social sciences, education, and academia, to help improve the nation’s ability to prevent multiple casualty violence. The participants developed eight recommendations, all centered on the need to create a strategic approach to information sharing in the prevention of multiple casualty violence. This book discusses the recommendations.