One of the most critical elements in any disaster planning and preparedness program is the use of an effective mass notification system to alert all staff, students, visitors, patients and vendors that there is an immediate emergency unfolding and instructing them how to safely respond.
For example, on October 1, 2015, an active-shooter breached a lecture hall at Umpqua Community College in Oregon and began shooting students.
The most distressing element of the Umpqua Community College incident was that the mass notification system didn’t work. The system had been purchased and implemented but when the disaster happened, the system did not work. See Full Story Here: http://www.securityinfowatch.com/article/12352849/planning-and-implementing-a-campus-mass-notification-system