Appendix A

Dependability Calculations

Kim R. Fowler,    IEEE Fellow, Consultant

Brief overview

Dependability describes how well and how long a system operates. It has analytical foundations in measurement science and stochastic processes. This short appendix only serves to whet your appetite for much more in-depth studies found in the recommended reading.

Dependability has the following components:

• Reliability

• Testability

• Safety

• Availability

• Maintainability

• Performability

Reliability is defined as the probability that the system will fully and correctly operate for a specified continuous time duration under specified conditions. If anything fails or degrades, then the system is considered to have failed. Reliability is an “all-or-none” ...

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