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One-way and two-way doors

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

Our reading of the idea · 6 claims from 6 people, in their own words

Who thinks with this

Chip HuyenDan ArielyGary KleinJan LeikeJeff BezosKent Beck

Decisions split into reversible two-way doors and irreversible one-way doors, and only the one-way doors deserve slow, deliberate scrutiny.

  1. Jeff Bezos Founder of Amazon in 1994 and of the space company Blue Origin in 2000 If you make the wrong decision, if it's a two-way door decision, you pick a door, you walk out and you spend a little time there. It turns out to be the wrong decision, you can come back in and pick another door. Some decisions are so consequential and so important and so hard to reverse that they really are one-way door decisions. You go in that door, you're not coming back. And those decisions have to be made very deliberately, very carefully. Jeff Bezos: Amazon and Blue Origin | Lex Fridman Podcast #405youtube.com · 14 Dec 2023 · 1:00:06 into the videoAll korrents from this video
    If you make the wrong decision, if it's a two-way door decision, you pick a door, you walk out and you spend a little time there. It turns out to be the wrong decision, you can come back in and pick another door. Some decisions are so consequential and so important and so hard to reverse that they really are one-way door decisions. You go in that door, you're not coming back. And those decisions have to be made very deliberately, very carefully.

    Watch from 1:00:06 plays here

    ↗Jeff Bezos: Amazon and Blue Origin | Lex Fridman Podcast #405youtube.com

    14 Dec 2023 · video · 2h 11m · spoken · official transcript

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
    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.

    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

The frightening part of giving agents more access is not bad code but irreversible action, so the guardrails to build next are guardrails on reversibility.

  1. Chip Huyen Engineer and writer on machine-learning systems You cannot just reverse that, right? It's just not working. So, I do think that we need to build out the whole guardrails for the reversibility of actions because that actually where things get really really scary. Chip Huyen: Building when it feels like there's nothing left to build - The Pragmatic Summityoutube.com · 29 Mar 2026 · 15:18 into the videoAll korrents from this video
    You cannot just reverse that, right? It's just not working. So, I do think that we need to build out the whole guardrails for the reversibility of actions because that actually where things get really really scary.

Releasing open weights is irreversible in a way that deploying a hosted model is not, so its risks cannot be mitigated later.

  1. Jan Leike Alignment researcher This is especially severe for open weight models, where deployment is essentially irreversible and mitigations can’t be improved later. Two alignment threat modelsaligned.substack.com · 8 Nov 2024All korrents from this piece
    This is especially severe for open weight models, where deployment is essentially irreversible and mitigations can’t be improved later.

Small, reversible, learnable decisions between equally informed sides should be left to people, with no paternalism

  1. Dan Ariely Behavioral economist and Duke University psychology professor; James B Small decision? Reversible? Easy to learn from? Both sides equally informed? Then leave people alone — that is exactly the territory where freedom to make our own mistakes is how we learn, and where paternalism has no business. When Is It OK to Decide for Other People?danariely.com · 17 Sept 2026All korrents from this piece
    Small decision? Reversible? Easy to learn from? Both sides equally informed? Then leave people alone — that is exactly the territory where freedom to make our own mistakes is how we learn, and where paternalism has no business.

When two options are almost perfectly balanced the choice does not matter, and those are exactly the decisions people agonize over.

  1. Gary Klein Research psychologist who founded naturalistic decision making And we get to this point, these are the hardest decisions people ever wrestle with. And the paradox is if the advantages and disadvantages of the two options are almost perfectly balanced, it doesn't matter which one we pick. And yet we will spend days and weeks going around in a funk, which one am I going to choose? Insights for Making Better Decisions | Gary Klein | Knowledge Project 144youtube.com · 9 Aug 2022 · 1:23:13 into the videoAll korrents from this video
    And we get to this point, these are the hardest decisions people ever wrestle with. And the paradox is if the advantages and disadvantages of the two options are almost perfectly balanced, it doesn't matter which one we pick. And yet we will spend days and weeks going around in a funk, which one am I going to choose?

    Watch from 1:23:13 plays here

    ↗Insights for Making Better Decisions | Gary Klein | Knowledge Project 144youtube.com

    9 Aug 2022 · video · 1h 39m · spoken · machine transcript

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