THE SHORT ANSWER

A decision log records the problem, alternatives and reasoning behind a choice. It helps teams distinguish a changed assumption from a discussion they have already resolved.

Capture decisions rather than meeting transcripts

Imagine an inventory product choosing a daily import instead of real-time synchronisation. “Import approved” omits the important context: the workflow tolerates that delay, the supplier API has constraints and usage may justify revisiting the choice later.

FieldUseful entry
QuestionHow fresh must inventory information be?
AlternativesManual entry, daily import, live sync
DecisionDaily import for the pilot
LimitationDoes not support an instant-stock promise
Revisit triggerNew operational requirement or usage evidence

Connect the record to delivery

Include a date, decision owner and links to affected scope. When a decision is superseded, retain its history and identify the current one. This helps a new team member understand a trade-off without assuming it was an accidental omission.

Should every implementation detail be logged?

No. Prioritise expensive-to-reverse choices, cross-team dependencies and uncertain assumptions. The log should reduce coordination effort. If documenting a minor choice costs more than the risk it clarifies, shorten the entry or leave it in the task discussion. A small, maintained record is more useful than a comprehensive archive nobody consults.

When a new buyer changes an assumption

A move from small self-serve teams to enterprise accounts may invalidate an earlier decision about identity management. Link the new requirement to the original assumption. This shows why the change is justified without pretending the previous decision was irrational.

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