This guide provides basic guidelines to help schools, in collaboration with law enforcement agencies, analyze their vulnerability to violence, theft, and vandalism, and suggest possible technologies to effectively address these problems. It describes existing commercially available technologies and urges thoughtful consideration of not only the potential safety benefits that may accrue from their use but also the costs that schools may incur for capital investments, site modifications, additional staffing, training, and equipment maintenance and repair. Topic areas include security concepts and operational issues, video surveillance, weapons detection devices (walk-through and handheld metal detectors and x-ray baggage scanners), entry controls, and duress alarms. Resource information including books, publications, web sites, and conferences conclude the guide. (GR)