Testing and Quality: Correlation does not equal Causation
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The presentation by Theresa Neate emphasizes that quality in software development requires both proactive and reactive strategies, and that merely adding more testers does not improve quality. It highlights the importance of continuous testing, collaboration, and building quality into the processes rather than relying on inspection. Ultimately, Neate stresses that quality is determined by the value it provides to stakeholders and must be integrated throughout the development lifecycle.
Testing and Quality: Correlation does not equal Causation
- 1. Quality =! Testing Testing and Quality: Correlation does not equal Causation Theresa Neate | Lead QA, REA Group 11 February 2020
- 2. About me Lead QA @ REA Group DevOps Girls co-organiser & coach ~20 years of “IT experience” ~8 as Lead QA / Practice Lead @TheresaNeate @DevOpsGirls theresaneate.com @TheresaNeate 2
- 3. Tonight Testing Quality Building in quality @TheresaNeate 3
- 4. Famous last words “Our quality is poor, we need more testers (or testing).” @TheresaNeate 4
- 6. Testing Testing is inspection & feedback (not assurance) @TheresaNeate 6
- 8. Minimise your manual testing But make it count Beware “Inattentional Blindness” @TheresaNeate Appropriately involve testing personnel 8
- 9. Testing should be continuous https://danashby.co.uk/2016/10/19/continuous-testing-in-devops/ @TheresaNeate 9
- 10. Quality “Quality is value to some person” – Jerry Weinberg @TheresaNeate 10
- 11. Measuring quality Testing Static Analysis Linting Testability analysis BDD or TDD Continuous Integration Monitoring and Alerting @TheresaNeate 11
- 12. Improving quality Reacting to the feedback, e.g. postmortems, bug triages, etc. @TheresaNeate “You can’t ‘fix’ people, but you can fix systems and processes to better support people making the right choices when designing and maintaining complex systems.” – SRE Handbook 12
- 13. Building In Quality @TheresaNeate Let’s take a proactive look 13
- 14. Building In Quality - ideas @TheresaNeate Work slicing 14
- 15. Building In Quality - ideas @TheresaNeate Reducing waste 15
- 16. Building In Quality - ideas @TheresaNeate Flow 16
- 17. Building In Quality - ideas @TheresaNeate Just Culture 17
- 18. Building In Quality - ideas @TheresaNeate Collaboration & visibility: Pair programming Pull requests *-driven-development Test coverage Kickoffs 18
- 19. Building In Quality - ideas @TheresaNeate Systems thinking 19
- 20. Moral of the story? @TheresaNeate Quality has both a proactive and reactive approach. You cannot test in quality. 20
- 21. Closing @TheresaNeate “Inspection is too late. The quality, good or bad, is already in the product.” – Deming 21
- 22. References for this talk @TheresaNeate Slides: theresaneate.com/content Blog: theresaneate.com/writing 22