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Report: Plotters of School Shootings Nearly Always Communicate Plans to Others
Jackman, T. (2021, April 1). Report: Plotters of school shootings nearly always communicate plans to others. The Washington Post.
This article reveals that school shooters communicate plans, and this communication may be used to prevent them from carrying out their violent attacks.

Safety Expert Shares Insights for Boosting Campus Threat Assessment, Management
McCarthy, C. (2020). Safety expert shares insights for boosting campus threat assessment, management. Campus Security Report, 16(9), 4–5. 
In the year and a half leading up to the Virginia Tech shooting, information was being gathered about the shooter. Without a process in place, gathering, tracking, communicating, and assessing what may have been a preventable threat was impossible.

United States: U.S. Secret Service Releases Operational Guide for Preventing Targeted School Violence
United States: U.S. Secret Service releases operational guide for preventing targeted school violence. (2018, July 14). TendersInfo News. 
The United States Secret Service National Threat Assessment Center released a tool to support the effort to end the prevalence of targeted violence affecting the Nation, the world, and most importantly, our schools.