Appendix 1

Glossary

A1.1. Terms Related to Failure

A1.1.1. Failure

Termination of the ability of an item to perform its specified function. OR, non-conformance to some defined performance criteria. Failures may be classified by: Meaningless without performance spec
1. Cause – Chapter 2
    Misuse: Caused by operation outside specified stress.
    Primary: Not caused by an earlier failure.
    Secondary: Caused by an earlier failure.
    Wearout: Caused by accelerating failure rate mechanism.
    Design: Caused by an intrinsic weakness.
    Software: Caused by a program error despite no hardware failure Chapter 17
2. Type –
    Sudden: Not anticipated and no prior degradation.
    Degradation: Parametric drift or ...

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