Slides - Åbo Akademi

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Software Reliability • Software, in general, logically more complex • Software failures are design failures • caused by design faults (have human nature) • design = all software development steps (from requirements to deployment and maintenance) • harder to identify, measure and detect • Software does not wear out
Failure rate The term failure intensity is often used instead of failure rate (to avoid confusions) Typically, a software is under permanent development and maintenance, which leads to jumps in the overall failure rate • May increase after major program/environmental changes • May decrease due to the improvements and bug-fixes
Page 1 and 2: Software Safety Lecture 8: System R
Page 3 and 4: Reliability Definition Reliability:
Page 5 and 6: Safety-critical Systems • Pervasi
Page 7 and 8: Hardware Failures The system is sai
Page 9 and 10: Failure Rate (ctd.) Classification
Page 11 and 12: Most Important Distributions Discre
Page 13 and 14: Reliability Parameters MTTF: Mean T
Page 15 and 16: Exponential Distribution The distri
Page 17 and 18: MTTF Example A system with a consta
Page 19 and 20: Example: Failure Rate Calculation F
Page 21 and 22: Series Systems Such a configuration
Page 23 and 24: Series-Parallel Combinations The mo
Page 25: M-of-N Arrangement A system consist
Page 29 and 30: Design diversity Each variant of so

Slides - Åbo Akademi

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