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Thursday 5.00 - elisabeth hendrickson - gb - final

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Elisabeth Hendrickson, Director for Quality Engineering at Cloud Foundry, Pivotal Labs

Video: https://www.youtube.com/watch?v=fMucUohYWI4

Nothing interrupts the continuous flow of value like bad surprises that require immediate attention: major defects; service outages; support escalations; or even scrapping just-completed capabilities that don’t actually meet business needs.

You already know that the sooner you can discover a problem, the sooner and more smoothly you can remedy it. Agile practices involve testing early and often. However feedback comes in many forms, only some of which are traditionally considered testing. Continuous integration, acceptance testing with users, even cohort analysis to validate business hypotheses are all examples of feedback cycles.

This talk examines the many forms of feedback, the questions each can answer, and the risks each can mitigate. We’ll take a fresh look at the churn and disruption created by having high feedback latency, when the time between taking an action and discovering its effect is too long. We’ll also consider how addressing “bugs” that may not be detracting from the actual business value can distract us from addressing real risks. Along the way we’ll consider fundamental principles that you can apply immediately to keep your feedback cycles healthy and happy.

Publicado en: Software
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Thursday 5.00 - elisabeth hendrickson - gb - final

  1. 1. On the Care and Feeding of Feedback Cycles Elisabeth Hendrickson Pivotal @testobsessed DevOps Enterprise 2014 (#DOES14) Care and Feeding of Feedback Cycles, Elisabeth Hendrickson (@testobsessed) 1
  2. 2. Who Am I? Care and Feeding of Feedback Cycles, Elisabeth Hendrickson (@testobsessed) 2
  3. 3. What's Feedback? Care and Feeding of Feedback Cycles, Elisabeth Hendrickson (@testobsessed) 3
  4. 4. Feedback Loops Care and Feeding of Feedback Cycles, Elisabeth Hendrickson (@testobsessed) 4
  5. 5. What Do We Need Feedback On? Care and Feeding of Feedback Cycles, Elisabeth Hendrickson (@testobsessed) 5
  6. 6. Feedback Latency Care and Feeding of Feedback Cycles, Elisabeth Hendrickson (@testobsessed) 6
  7. 7. A Traditional Long Feedback Cycle (and why no one does this anymore) Care and Feeding of Feedback Cycles, Elisabeth Hendrickson (@testobsessed) 7
  8. 8. Latency, Speculation, and Risk Care and Feeding of Feedback Cycles, Elisabeth Hendrickson (@testobsessed) 8
  9. 9. Latency, Speculation, and Risk Care and Feeding of Feedback Cycles, Elisabeth Hendrickson (@testobsessed) 9
  10. 10. Latency, Speculation, and Risk Care and Feeding of Feedback Cycles, Elisabeth Hendrickson (@testobsessed) 10
  11. 11. Latency, Speculation, and Risk Care and Feeding of Feedback Cycles, Elisabeth Hendrickson (@testobsessed) 11
  12. 12. Empirical Evidence Trumps Speculation Every. Single. Time. Care and Feeding of Feedback Cycles, Elisabeth Hendrickson (@testobsessed) 12
  13. 13. Time Value of Information A little information today is worth more than that same information tomorrow. Care and Feeding of Feedback Cycles, Elisabeth Hendrickson (@testobsessed) 13
  14. 14. Eliminate Speculation Buildup Care and Feeding of Feedback Cycles, Elisabeth Hendrickson (@testobsessed) 14
  15. 15. Beware Fragile Care and Feeding of Feedback Cycles, Elisabeth Hendrickson (@testobsessed) 15
  16. 16. Beware Fragile Care and Feeding of Feedback Cycles, Elisabeth Hendrickson (@testobsessed) 16
  17. 17. Beware Fragile Care and Feeding of Feedback Cycles, Elisabeth Hendrickson (@testobsessed) 17
  18. 18. Beware Fragile Care and Feeding of Feedback Cycles, Elisabeth Hendrickson (@testobsessed) 18
  19. 19. Beware Fragile Care and Feeding of Feedback Cycles, Elisabeth Hendrickson (@testobsessed) 19
  20. 20. Beware Fragile Care and Feeding of Feedback Cycles, Elisabeth Hendrickson (@testobsessed) 20
  21. 21. Different Kinds of Feedback Local integration and unit testing Automated tests in CI Story acceptance Exploratory testing Environment monitoring/metrics (canaries) Dog fooding Support tickets Care and Feeding of Feedback Cycles, Elisabeth Hendrickson (@testobsessed) 21
  22. 22. Visibility Care and Feeding of Feedback Cycles, Elisabeth Hendrickson (@testobsessed) 22
  23. 23. Fast-and-Complete Feedback Recipe Check + Explore + Release — Automatically check that the emerging system behaves as expected with every new change. — Explore both to discover other risks and to verify that the checks are sufficient. — Release early and often. Care and Feeding of Feedback Cycles, Elisabeth Hendrickson (@testobsessed) 23
  24. 24. Tighten Feedback Loops — Work in small pieces — Find and squash wait states — Parallelize — Remove duplicate tests — Drive tests to the lowest level possible Care and Feeding of Feedback Cycles, Elisabeth Hendrickson (@testobsessed) 24
  25. 25. Secret Sauce Fast Feedback Creates Learning Organizations Care and Feeding of Feedback Cycles, Elisabeth Hendrickson (@testobsessed) 25
  26. 26. Where I Need Help CI is deploying a big distributed system. It can take 1-2 hours to run. How do you tighten feedback cycles for devs fixing a build? Care and Feeding of Feedback Cycles, Elisabeth Hendrickson (@testobsessed) 26

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