Local governments, large and small, support a vast array of computer hardware and software systems. They exchange public and private information via the Internet and a variety of “secure” networks among fellow employees, citizens, clients, and other governments. All expect information systems to do the work they were designed to do, be available when they are needed, and maintain the reliability and the integrity of the information that is contained within them. The importance of security is heightened, and security is made more difficult, as an increasing number of people connect to public information systems.