StarWest 2012 - Agile Defect Management: Focus On Prevention
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Efficient agile organizations focus on defect prevention rather than downstream defect discovery, because discovering defects during or after testing adds to development costs. Delaying discovery and repair of defects can make an agile team feel like they are operating in a mini-waterfall. Sharing his experience with Scrum/ Kanban teams, Leveraging the lean concept of limiting work in progress, David Jellison describes how grouping defects into two major categories—work-in-progress defects and escaping defects—reduces development costs and improves reliability in the field. Dave illustrates how to manage problem discovery early and minimize the existence of escaping defects. Treating escaping defects as the exception rather than the norm results in a much smaller defect backlog and increased customer satisfaction. This approach encourages increased collaboration between quality engineers and developers, and shifts the focus of team measures from defect counts to product delivery velocity and cycle time, with increased confidence in quality as the work is completed.
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StarWest 2012 - Agile Defect Management: Focus On Prevention
- 1. Agile Defect Management Focus On Prevention David Jellison Director, Quality Engineering djellison@constantcontact.com Twitter: davidjellison
- 2. You Will Learn Categorizing defects drives defect context management Testing is part of delivering a story or feature Detecting and resolving defects as the work is delivered prevents backlog Attaching an in-progress defect to a current story encapsulates the defect in the current work Escaping defects become the exception rather than the norm 2 Twitter: davidjellison
- 3. The One Finding The Most Bugs Wins! Downstream Testing Approach Lord of the Rings: Legolas & Gimli counting kills Twitter: davidjellison
- 4. Preventing Bugs is Craftsmanship upstream Testing Approach Twitter: davidjellison
- 5. Quest for Zero Defects You can only manage what is known Crosby’s “Zero Defect” standard manages to requirements (http://en.wikipedia.org/wiki/Zero_Defects) Agile changes the game, managing business value to the customer frequently Need a pattern to manage defects that we inevitably discover during and after release Never really reach 0 Defects 5 Twitter: davidjellison
- 6. Defect Discovery Moving Defect Discovery Earlier 6
- 7. Traditional Defect Discovery Trends 7 Twitter: davidjellison
- 8. Late Defect Discovery Costs Opportunity cost Not working on other things Developer Context switching Time to get acclimated and then back again Rebuild and test time More cycles to deliver the fix Damage control Support time and reputation Other hidden costs… 8 Twitter: davidjellison
- 9. Traditional Defect Discovery Trends Defect debt accumulation Delay in resolution Defects resolved Dev/QE aligned 9 Twitter: davidjellison
- 10. Defect Discovery Improvement Plan Stop defect debt accumulation Move defect discovery up in the development cycle Embed QE into teams with Dev/QE alignment Prevent defects through design review & test automation Write failing regression tests as defects are discovered Test in sandbox Don’t wait for final integration environment to test Continuous build and continuous integration patterns Whole-team responsibility for quality Clear acceptance criteria for all new work Everyone tests Automated test code reviews with developer 10 Twitter: davidjellison
- 11. Defect Prevention Automating Along The Way 11
- 12. Defect Discovery Late Downstream test teams focus on defect discovery 12 Twitter: davidjellison
- 13. Defect Discovery Early Embedded test teams focus on defect prevention Regression tests assure no system failures 13 Twitter: davidjellison
- 14. Agile Practices Smaller cycles Scrum Collaboration Design reviews Test early and often Test Driven Development Continuous Integration Automated Kanban Regression 14 Twitter: davidjellison
- 15. Automated Regression Tests Available Test Time Unattended Test Runs 15 Twitter: davidjellison
- 16. Defect Categorization Introducing WIP Defects 16
- 17. Categorizing Defects Escaping Defects Discovered defects allowed into the field Undiscovered defects found in the field 17 Twitter: davidjellison
- 18. Categorizing Defects WIP (work in progress) Defects Defects discovered in new code not yet delivered to field Becomes additional acceptance criteria for delivery Treat as subtasks of feature work Caged by the parent work in progress 18 Twitter: davidjellison
- 19. Managing Defect Discovery Its OK to not write defects if there are failing automated tests to manage Promote failing tests to WIP defects if need to manage separately Promote WIP defects that are still failing at time of delivery to escaping defects and added to the backlog 19 Twitter: davidjellison
- 20. Focus on Prevention Develop failing regression tests when discovered manually Continuous feedback through failing test run reports Associate WIP defects with feature work in progress 20
- 21. Managing Escaping Defects Delivering business value over no defects No unknown failures in regression tests Coordinate planned escaping defects with customer support Reduce escaping defects to less than you can count on two hands 21
- 22. Managing Escaping Defects “Jellison Jazz Hands” Twitter: davidjellison
- 23. Driving escaping defects down 23 Twitter: davidjellison Number s for illustration only
- 24. Escaping Defect Reduction Plan Set expectation in the teams that fixing WIP defects is part of the acceptance criteria Add escaping defects in the field to the backlog and rank along with other work Plan to fix some number of escaping defects from the backlog in each development cycle Treat escaping defects as the exception rather than the norm 24 Twitter: davidjellison
- 25. Examples Using WIP Defects 25
- 26. Example: WIP Defects/Escaping Defects Shifting the focus to WIP defects results in far fewer escaping defects in the field, even with increased discovery WIP Defects [blue] Escaping Defects [red] 26 Twitter: davidjellison
- 27. Example: WIP Defects/Escaping Defects Each team may be in a different place with business risk and can manage escaping defects differently Develop a theme strategy WIP Defects [ red & blue] Escaping Defects [green] 27 Twitter: davidjellison
- 28. What We Covered Categorizing defects drives defect context management Testing is part of delivering a story or feature Detecting and resolving defects as the work is delivered prevents backlog Attaching an in-progress defect to a current story encapsulates the defect in the current work Escaping defects become the exception rather than the norm 28 Twitter: davidjellison
- 29. Contact: David Jellison Dir, QE Constant Contact, Inc. 1601 Trapelo Road Waltham, MA 01451 djellison@constantcontact.com P: 339-222-5712 Blog: http://davidjellison.wordpress.com Twitter: davidjellison http://ConstantContact.com/Careers 29 Twitter: davidjellison
Notas del editor
- Phillip Crosby’s “Absolute Defect Management” with a “Zero Defect” quality standard can only be met when validating against very clear and precise requirements and standards.
- The relative cost of defect discovery at least doubles at each stage of .