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Computer systems are used to perform many critical tasks, including guiding aircraft, scheduling railroads, assisting in surgery, controlling nuclear reactors, performing financial transactions, military command and control, and a host of other applications. Properties that such a system must have can include availability, reliability, safety, and security. Although the study of these properties evolved as separate disciplines, they have in common the fact that a user must have a high degree of confidence in the service that the system delivers. The notion of dependability captures these concerns within a single conceptual framework, making it possible to approach the different requirements of a critical system in a unified way.
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