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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