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← People and their mental models

Kent Beck's mental models

2 claims Kent Beck made fit 2 mental models. Most often: One-way and two-way doors, Skin in the game. Everything they said here.

Models they name

Their own words name the idea.

One-way and two-way doors

Decide fast when a choice can be undone, and slowly when it cannot.

Others who think with this model

Chip HuyenDan ArielyGary KleinJan LeikeJeff Bezos

Open the model page

Always try your stupid ideas when the experiment is cheap and reversible, because the one that works has no competition.

  1. Kent Beck Creator of extreme programming and test-driven development Always try your stupid ideas if you can do it cheaply and reversibly. Jumping off a bridge is not a reversible decision. Not talking about that. I'm talking about stuff like this where you're just like, "Here's a stupid idea." 99 times out of a 100 it'll fail. But that one time you won't have any competition cuz nobody else is stupid enough to try this idea. How Kent Beck shapes the software engineering industryyoutube.com · 1 Jul 2026 · 1:20:14 into the videoAll korrents from this video
    Their wordsAlways try your stupid ideas if you can do it cheaply and reversibly. Jumping off a bridge is not a reversible decision. Not talking about that. I'm talking about stuff like this where you're just like, "Here's a stupid idea." 99 times out of a 100 it'll fail. But that one time you won't have any competition cuz nobody else is stupid enough to try this idea.

    Where this was said

    Watch from 1:20:14 plays here

    ↗How Kent Beck shapes the software engineering industryyoutube.com

    1 Jul 2026 · video · 2h 28m · spoken · machine transcript

Skin in the game

Trust the judgment of people who pay for being wrong over people who only comment.

Others who think with this model

David Heinemeier HanssonMiles BrundagePolly D'Arcyswyx

Open the model page

An outside expert's understanding of somebody else's problem is bounded, because they do not have to live with the design after they leave.

  1. Kent Beck Creator of extreme programming and test-driven development Your understanding of somebody else's problem is bounded because you're not in the middle of it. You don't have the same skin in the game. If you're not semiconductor test engineer, you don't have as much skin in the game as somebody who is because they're going to have to be using this interface for a long time after you're gone. How Kent Beck shapes the software engineering industryyoutube.com · 1 Jul 2026 · 0:43:00 into the videoAll korrents from this video
    Their wordsYour understanding of somebody else's problem is bounded because you're not in the middle of it. You don't have the same skin in the game. If you're not semiconductor test engineer, you don't have as much skin in the game as somebody who is because they're going to have to be using this interface for a long time after you're gone.

    Where this was said

    Watch from 0:43:00 plays here

    ↗How Kent Beck shapes the software engineering industryyoutube.com

    1 Jul 2026 · video · 2h 28m · spoken · machine transcript