The discussion also summarizes the relevant British standards and codes. An overview explains how alarm systems work, what they do, how they can be planned, and how proposed systems can be checked. It also describes countermeasures against other hazards such as shoplifting, employee theft, fire, fraud, and liability claims. Details are given regarding basic alarm systems, control equipment, sensors, and closed-circuit television. In addition, a technical section explains how to install and test intruder alarms, identify faults in intruder alarms, and maintain an alarm system. Figures, diagrams, tables, illustrations, and index.