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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