Fault Tolerance

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The capability of the software product to maintain a specified level of performance in cases of software faults or of infringement of its specified interface. [ ISO/IEC 9126-1 ]

Other Definitions

Fault Tolerance [ IEEE 610.12 ]
  1. The ability of a system or component to continue normal operation despite the presence of hardware or software faults.
  2. The number of faults a system or component can withstand before normal operation is impaired.
  3. Pertaining to the study of errors, faults, and failures, and of methods for enabling systems to continue normal operation in the presence of faults.


  • The specified level of performance may include fail safe capability. [ ISO/IEC 9126-1 ]

See also



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