Over the last 25 years, researchers, practitioners, and policymakers have consistently recognized the need for a comprehensive approach to school safety. However, identifying the key components of a comprehensive approach and the ideal way to balance and implement those components has proved challenging. To address this challenge, the National Institute of Justice's (NIJ) Comprehensive School Safety Initiative (CSSI) awarded approximately $246 million in grants from 2014 to 2017 to support nearly 100 research projects on school safety. This fact sheet summarizes the findings from these CSSI projects to help schools identify and implement the components of a comprehensive framework for school safety, reflecting the diversity of programs and practices available for school safety and the challenges and opportunities associated with implementing them in America's schools.