This School Safety Tip Line Toolkit is designed to support the operationalization, implementation, and maintenance of school safety tip lines. It is a compendium of multifaceted briefs designed to engage stakeholders in assessing key attributes of tip line implementation and sustainability; the nascent evidence base involving tip lines; current legislation establishing tip lines; suggested tip line metrics and data elements; and resource considerations, including cost-benefit analyses. The resources in this document are intended to serve school stakeholders at the state, local, district, and school levels who are invested in school and student safety. This toolkit is informed by RTI International’s research and evaluation on school safety, including the National Institute of Justice-funded study, Assessment of National and State Tip Line Technology as a Strategy for Identifying Threats to School Safety, and input from school safety experts and staff operating state school safety tip lines. RTI International is an independent, nonprofit research institute dedicated to improving the human condition. For more information, visit www.rti.org.