Six months from now, the decision will look strange. ‘Why on earth did we pick the more expensive contractor?’ If the reason was not captured, you have two bad options: trust a vague memory, or re-litigate the whole question. The cure costs one sentence at decision time: not just what you chose, but why.
Decisions detach from reasons by default
The outcome gets written down because it is actionable—the reasoning stays in the conversation that produced it. Later, the outcome is all that remains, stripped of the constraint that forced it: the deadline that existed, the budget that did not, the person who was unavailable.
Capture the because in one sentence
‘Chose Kowalski—more expensive, but the only one who could start before September.’ That is a complete decision record: choice, tradeoff, deciding constraint. Spoken into a voice memo after the call, it takes ten seconds.
- Name the alternative you rejected.
- Name the constraint that decided it.
- Note who agreed, if the decision was shared.
Keep the materials within reach
The estimate photo, the comparison thread, the voice memo with your doubts—linked to the decision note, they turn ‘I think we had reasons’ into an inspectable case file. This matters most in disputes: memory softens, but the dated photo of the quote does not.
Reasons make revisiting honest
When circumstances change, a preserved reason tells you whether the decision should change too. ‘We chose it for the September start’ is re-examinable the moment September slips. Without the reason, every revisit starts from zero—and usually just re-runs the old argument with worse data.
Which decisions are worth recording
Not all of them, and trying to record all of them is how the habit dies in a fortnight. A decision earns thirty seconds of voice when at least two of these are true:
- It is expensive or slow to reverse—money committed, a contract signed, a person hired.
- It rejected a specific alternative that someone will eventually propose again.
- It rested on a condition that might expire: a date, a budget, someone's availability.
- Somebody disagreed. Dissent is the highest-value thing to preserve and the first thing forgotten.
- You will have to explain it later to a person who was not in the room.
The trap of the reason you record
There is a genuine problem with self-reported reasoning: what you write down is the justification you are aware of, which is not reliably the cause of the choice. Decisions get made on instinct, fatigue, and who spoke last, and the reason recorded afterward can be a tidy story assembled around a decision already taken.
This does not make the practice useless—it makes one habit important. Record the constraint rather than the argument wherever you can. ‘Only vendor who could start before September’ is a checkable fact; ‘seemed like the stronger team’ is a feeling that will look like evidence in six months and is not.
Recording the dissent is the other correction, and it is the reason it appears on the list above. An objection you overruled is the one piece of the record your own narrative will not have smoothed over, which is exactly why it is worth more than your summary of why you were right.
Record the choice, the rejected alternative, and the constraint that decided it—then link the evidence. One sentence now spares you the same argument every six months.