Doors serve a variety of needs and purposes in schools: (1) Exterior doors provide building security and protection from the elements; and (2) Interior doors control the movement of people among school spaces, help control noise and air flow, and act as flame and smoke barriers during a fire. In a lockdown, they serve as safety barriers. From a…

Crisis planning includes making preparations for managing school buildings, grounds, occupants, and rescue and recovery personnel during and after a crisis. In "Practical Information on Crisis Planning: A Guide for Schools and Communities, the U.S. Department of Education's Office of Safe and Drug-Free Schools" states: When a crisis…