Failure

The event, or inoperable state, in which any item or part of an item does not, or would not, perform as previously specified.

Hard Failure
A product under test ceases to work correctly. It does not resume correct operation, even when the stressing environment is eased.

Soft Failure
A product under test ceases to operate correctly, but resumes correct operation when the stressing environment is eased.

See also: Common Mode Failure Analysis, Failure Mode, Failure Mode and Effects Analysis.

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Subjects: Systems Engineering