The National Policing Institute and the COPS Office created the Averted School Violence (ASV) database to provide a platform for sharing information about averted incidents of violence in elementary, secondary, and higher education. This report examines 12 case studies of incidents in which planned violence targeting K-12 schools was averted by the potential attackers' peers, school administrators, and other school safety stakeholders including school resource officers (SRO). Each case includes a discussion of lessons learned from examining the potential attackers' intentions and the actions of those who averted the attack.