Direct answer
What is a two-way door decision?
Where the idea comes from
The phrase comes from the “High-Velocity Decision Making” section of Amazon’s 2016 letter to shareholders. In it, Jeff Bezos writes: “Many decisions are reversible, two-way doors.” The same section argues that “most decisions should probably be made with somewhere around 70% of the information you wish you had”, because waiting for near-certainty makes you slow and because you can correct many bad decisions quickly.
The metaphor is useful, but it leaves three things out. Undoing has a cost, which can be money, time or reputation. A decision may be reversible for you and not for others, such as employees, customers or family. And many small reversible decisions can add up to something that is hard to reverse.
Examples of two-way and one-way doors
Most real decisions sit on a spectrum. These are typical positions, not rules; your context can move a decision either way.
- Usually two-way: trying a tool on a monthly plan, testing a price change for a week, taking a short contract, running an A/B test on a landing page, renting before buying.
- Often closer to one-way: selling a company, signing a long lease or multi-year contract with penalties, moving a family to another country, agreeing to a broad non-compete, making a large purchase you cannot resell.
- Depends on the details: changing jobs, hiring, launching a public product, choosing a supplier. The terms of exit decide which side of the line they fall on.
Pause before the recommendation
Three answers could change this decision.
- 01
What exactly would I have to undo, and what would undoing it cost in money, time and trust?
- 02
Who else is affected, and could they reverse it too?
- 03
Could a smaller version of this decision give me most of the information first?
How to classify a decision in five minutes
- Cost to undo: how much money would it cost to reverse this?
- Time to undo: how long would it take, and is there a deadline after which it is impossible?
- People affected: who else pays if you reverse it, and how much trust would be lost?
- Doors closed: does this exclude other options, for example through exclusivity or a long term?
- Visibility: does it become public in a way that cannot be taken back?
If all five are low, decide quickly and correct later. If any of them is high, slow down or shrink the decision until it is low.
Smallest reversible test
Turn a one-way door into a two-way door.
Find the smallest version of the commitment that still produces real evidence: a pilot, a trial period, a short contract, a reversible purchase or a prototype. Write the measure you will use and the date you will decide.
- Measure
- What the small version taught you, what it cost, and how much of the full commitment remains irreversible.
- Success
- The small version separates the options clearly enough that the full decision becomes proportionate.
- Stop
- Stop if the “trial” quietly creates the same exposure as the full decision, or if it cannot distinguish the options.
Turning one-way doors into two-way doors
- Run a pilot with an opt-out instead of signing the full contract.
- Ask for a trial period, even if it costs a little more, and treat the price as the cost of keeping an option.
- Stage the commitment: milestones, smaller first payments, or a shorter first term.
- Rent before you buy, or borrow before you rent.
- Time-box the decision: agree the evidence you need and the date you will decide.
- Agree the exit in advance: what ends the arrangement, and what it costs.
Two traps to avoid
The first trap is treating a two-way door like a one-way door: consulting everyone, asking for more analysis and letting a small choice take weeks. The cost is slowness and lost learning. The second trap is treating a one-way door like a two-way door because “we can always change it later”. The cost is a commitment you did not fully consider. Classifying the door first is what keeps the two from being confused.
Worked example
What changes after the questions?
A restaurant owner wants to sign a five-year lease on a second location because the first one is always full.
The questions show that the unknown is whether the same customers will travel to a different area, and that the lease is the part that cannot be undone.
The owner runs a three-month pop-up in the target neighbourhood first, measures repeat customers and margin, and negotiates a shorter first term before signing anything long.
Frequently asked questions
What is a two-way door decision?
A decision that can be reversed at an acceptable cost, so it can be made quickly, tested in practice and corrected if it does not work.
What is a one-way door decision?
A decision that is hard or impossible to undo, or whose reversal costs a lot of money, time or trust. These deserve more careful thought and, where possible, a smaller test before committing.
Where does the two-way door idea come from?
It was popularised by Jeff Bezos in Amazon’s 2016 letter to shareholders, in the section on high-velocity decision making.
Does the 70% rule mean I should decide with incomplete information?
The letter says most decisions should probably be made with around 70% of the information you wish you had. It is aimed at reversible decisions. It is not a licence to skip care on decisions that cannot be undone.
How do I know if my decision is reversible?
Check the cost and time to undo, who else is affected, whether it closes other doors, and whether it becomes public. If any answer is high, shrink the decision or slow down.
Can Decide Smaller tell me if my decision is a two-way door?
It asks the questions that reveal how reversible your decision is and proposes a small test. It is a thinking aid, not an authority, and the decision remains yours.
Where this guide stops
A thinking tool is not an authority.
Sources and method notes
- Amazon 2016 letter to shareholders, “High-Velocity Decision Making” (one-way and two-way doors)
- Harvard Business Review: “Performing a Project Premortem” (Gary Klein, 2007)
This page applies those ideas through the original Decide Smaller three-question and reversible-test workflow.