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It is widely agreed that building correct fault-tolerant systems is very difficult. To address this problem, this paper introduces a new model-based approach for developing masking fault-tolerant systems. As in component-based software development, two (or more) component specifications are developed, one implementing the required normal behavior and the other(s) the required fault-handling behavior. The specification of the required normal behavior is verified to satisfy system properties, whereas each specification of the required fault-handling behavior is shown to satisfy both system properties, typically weakened, and fault-tolerance properties, both of which can then be inferred of the composed fault-tolerant system.
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