M is for Measurements.
After a lock down drill occurs there is a debriefing session with the administration and police to talk about what went right, and what could have been done better. Measuring the outcomes after an event and comparing them to the last drill helps the safety team make decisions for future drills. Adjustments can be made if necessary. Measurements are important in making assessments which will enable school staff members to make good decision in implementing school safety procedures.