Long used on school campuses to safeguard facilities and contents after hours, alarm systems are increasing in sophistication and variety of available features. Intrusion alarm systems are being integrated with access control systems and closed-circuit television monitoring systems. Because not all sites within a district gain the same benefits from electronic systems, it is important that districts: assess potential risks, prioritize needs and set goals before they design a security system. During the planning process, school personnel should consult security professionals for technical advice on what kind of system to acquire, how best to install it, who should operate and monitor the system, and who should respond to alarms. Training is an important aspect of a security system, and all personnel authorized to have after-hours access should receive initial training, written instructions and follow-up training.