Despite decades of effort, active shooter response strategies in the U.S. continue to result in high victim counts in many incidents. This fast-paced, information-rich presentation will explore how two critical planning factors—time and math—can significantly reduce casualties when properly prioritized. It will examine how many default response plans overlook these elements, and offer practical changes agencies can adopt to improve outcomes. Attendees will leave with a clearer understanding of how to align response strategies with the realities of active shooter events to better protect lives.