One-way door, or a door you can walk back through
The term describes a property of the choice, not its size. A decision is a one-way door when the state you were in before no longer exists to return to — you sold the business, you had the operation, you emigrated and gave up the residency. A decision is reversible — a two-way door — when you could undo it for a cost you could absorb without much thought: a rental, a trial period, a returnable order, a course inside its refund window. The pair of terms was popularized by Jeff Bezos in Amazon’s 2015 letter to shareholders, and they have stuck because the distinction is genuinely useful.
Most real decisions sit between those two, and it is worth naming where. A useful four-way split:
- Reversible (a two-way door). Undoing it costs almost nothing. These deserve far less deliberation than they usually get — trying it produces better information than any amount of thinking about it.
- Awkward. A lease, a used car, a year-long program. Getting out costs real money and some months. Worth genuine checking; not worth agonizing.
- Costly. A house move, a career change, a major renovation. Undoing it is possible and painful, and the pain is mostly transaction costs and lost time.
- A one-way door. The previous state is gone. These earn everything you can give them: the diligence, the delay, the pre-mortem, and the second opinion.
Why it matters more than how the decision feels
Anxiety tends to scale with attention rather than with stakes. A decision you have been turning over for months feels enormous; one you have not thought about feels routine. Neither of those has anything to do with what it would cost to be wrong. The predictable result is that people over-research the decisions that are nagging them and under-research the ones that are not — and the two sets are often different.
Pricing the unwind replaces a feeling with a number you can act on. Ask what it would take, in money and in months, to reverse the choice within two years. Do it for your top two options, because they are frequently very different, and that difference is itself a criterion you may not have written down.
Turning reversibility into an amount of checking
Once you have the unwind cost, you can turn it into a budget rather than a mood. How close the decision is sets how likely you are to be picking wrong; the unwind cost sets what picking wrong would cost. Their product is what checking the decision has earned.
The practical consequence is often counter-intuitive. A hard-to-undo decision that you have already exhausted yourself over is usually one you are under-checking, not over-checking — and a reversible one you have been agonizing about is usually one you should simply try. Exhaustion is not evidence in either direction.
A caution about decisions that are only technically reversible
A choice can be reversible on paper and not in practice. You can sell the house again, but you cannot un-move the children mid-year, and you cannot recover the eighteen months. When you price the unwind, price what it would actually take rather than what the transaction would cost. If part of it is something money genuinely cannot buy back, that part belongs on your criteria list as its own line, openly weighted, rather than hidden inside this calculation.
Where to start
The reversibility test, the framing questions that come before it, and the four prompts that force the option nobody listed are all in the free Frame the Decision mini-guide — eight pages, no email required. The method that turns an unwind cost into a diligence budget, and then spends that budget against a ranked list of checks, is in How to Make a Big Decision.
General decision-making guidance — not financial, legal, medical, or tax advice. Where a decision touches money, health, property or a contract, take it to someone qualified who knows your situation.
