Failure

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Deviation of a system or component from specified or expected behavior. This definition ? assumes that the functional specification in itself is adequate or the expectation of the system behavior is reasonable.

Any incident with negative consequences, where a system or component deviates from its expected behavior.

The inability of a system or component to perform its required functions within specified performance requirements [IE610.12]. A failure is characterized by the observable symptoms of one or more defects that have a root cause in one or more faults.

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