Why does decision documentation fail?

The most common reason decision documentation fails: Documenting only the conclusion without the context. Writing 'We chose React' tells future-you nothing. Writing 'We chose React because the team already knows it, the timeline was six weeks, and we valued shipping speed over long-term performance' tells future-you everything. The decision without the rationale is a fact. The decision with the rationale is a learning object.

The fix: Pick one decision you made in the last week — what to work on, which tool to use, whether to attend a meeting, anything. Write a five-line decision record: (1) What you decided. (2) What alternatives you considered. (3) What information you had. (4) What you were optimizing for. (5) What would make you revisit this decision. Do it now, not later. You will be surprised how much of your reasoning has already faded.

The underlying principle is straightforward: The most valuable thing to capture is why you chose what you chose. Decisions decay faster than facts — and unlike facts, they cannot be reconstructed after the outcome is known.