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What Kent Beck thinks about software quality

@kent-beck · 38 positions · 0 changes of mind

Creator of extreme programming and test-driven development, an original signatory of the Agile Manifesto, and the author of Test-Driven Development: By Example and Tidy First?

Kent Beck did not write this page.

We collected these quotes from things they published elsewhere, and every quote links to where it was said. They have no account here and have not endorsed this site. Quotes are word for word; the short line under each one is our own restatement, not their wording. Their own site. Is this you? Claim it or ask us to remove it. Or tell us what is wrong here.

6 dated positions, 2026, in their own words. Our reading of what Kent Beck has said — not written or endorsed by them.

  1. Our readingThe industry is now accumulating code faster than it is accumulating trust, and trust only comes from having struggled to understand the domain yourself.

    Their wordswe're accumulating code faster than we're accumulating trust and that sense of trust comes from me struggling to understand some domain concept I get it. I represent it in the code. I have I write tests that demonstrate that I really did understand it. And now I trust my program.

    ↗How Kent Beck shapes the software engineering industryyoutube.com 2nd of 28 in this recording

    Interesting

  3. Our readingUnit testing frameworks arrived so late because testing was a status divide, and testers had every incentive to keep a separate tool and language of their own.

    Their wordsSo beforehand because of this social divide between programmers and testers. There was a lot of incentive for the testers to have their own language. This is my tool. I know how to run it. I'm going to run it.

    ↗How Kent Beck shapes the software engineering industryyoutube.com 8th of 28 in this recording

    Interesting

  5. Our readingHaving an AI agent write tests costs tokens in the short run and saves them in the long run, because the classic failure is that the code does not work.

    Their wordsIt costs tokens in the short run, but it can save them in the long run because one of the classic genie mistakes is stuff doesn't work.

    ↗How Kent Beck shapes the software engineering industryyoutube.com 11th of 28 in this recording

    Interesting

  7. Our readingTDD fell out of fashion partly because its advocates turned it into a moral test of professionalism, when people write very good software with a wide variety of workflows.

    Their wordsAnd then there were people who used it as a moral cudgel. Like you should be if you're not using TDD, you're not professional. And that's just such People can write very good software with a wide variety of workflows.

    ↗How Kent Beck shapes the software engineering industryyoutube.com 12th of 28 in this recording

    Interesting

  9. Our readingTDD earns its keep only where work alternates rapidly between doing and learning; choosing it is a practical decision, never a moral one.

    Their wordsIt's when you have this rapid alternation between I do a thing, I learn a thing, I do a thing, I learn a thing, I do a thing, I learn a thing. That's where TDD is really powerful. But it's not a moral decision. It's a practical decision.

    ↗How Kent Beck shapes the software engineering industryyoutube.com 13th of 28 in this recording

    Interesting

  11. Our readingFacebook could ship safely without much unit testing because it had many independent layers of feedback, each one catching what the earlier layers missed.

    Their wordsThen you had code review which gave you another level of feedback. You could roll out internally more frequently. And everybody was using Facebook for all kinds of stuff, personal and internal business stuff. So whatever feature you developed, people would start using it immediately. So you get another round of feedback. Then we had this phased roll out process where you'd start rolling your stuff out. If there was a problem, the blast radius would be limited to a a few million people.

    ↗How Kent Beck shapes the software engineering industryyoutube.com 18th of 28 in this recording

    Interesting