Software bugs
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This document discusses software bugs including their history, causes, impact, and classification. It begins with definitions of common terms used to describe bugs and errors. Key events that resulted from software bugs like the Mariner 1 space probe failure and radiation therapy machine bugs that killed patients are summarized. The document also outlines common reasons why bugs are introduced during development including lack of testing and unrealistic timelines. It concludes with classifications of bugs and contact information for the author.
Software bugs
- 2. Agenda Mistake metamorphism First software bug Bug fixing cost Reasons why bugs get into software Software bug classification Types of software bugs Software bug impact Worst software bugs
- 3. Mistake metamorphism â–ª Mistake â–ª Anomaly â–ª Fault â–ª Failure â–ª Error â–ª Exception â–ª Crash â–ª Bug â–ª Defect â–ª Incident â–ª Side effect
- 6. Reasons why bugs get into software Last minute changes Developed by humans Communication failure Poor developing techniques Lack of trained testing staff Buggy third-party instruments Misapplication of technology Unrealistic development timeframe
- 7. Software bug classification Priority/ Urgency Severity/ Impact Related module/ component Probability/ Visibility Related dimension of quality Phase detected Phase injected
- 8. Types of software bugs
- 9. Consequences of bugs in software
- 10. Mariner I space probe "The most expensive hyphen in history" Dates: 1962 Cause: error in formula Consequences: rocket diverted from its intended path on launch -> was destroyed Over 18.2 million dollars were lost.
- 11. Soviet gas pipeline Dates: 1982 Cause: "race condition" Consequences: at least 5 patients died, many more were injured "The largest non-nuclear explosion in the planet's history"
- 12. Therac-25 medical accelerator Dates: 1985-1987 Cause: "race condition" Consequences: at least 5 patients died, others were seriously injured
- 15. Thank you!