Small teams don't make too few decisions. They make the same decisions three times, because nobody remembers the first two. The backup-vendor debate, the "we'll revisit in Q3" answer, the tool rejected in March for the missing SSO — six months later, every one of those debates starts from zero because the decision and its reasoning lived in a chat thread everyone scrolled past.
A decision log fixes this with one line per decision. Not a wiki. Not a governance process. One line, five fields:
- Date — the day it was decided, not the day someone wrote it down.
- Decision — past tense: "We switched backups to X." If you can't phrase it as something that happened, it isn't logged yet.
- Owner — the person who made the call per your delegation-of-authority matrix, not whoever argued longest.
- Why — the decisive reason, one clause. "Vendor B costs 40% less per seat" beats "we compared options."
- Revisit — a date or a trigger. This is the field everyone skips, and the one that does the real work.
Why the revisit date is the whole game
"We decided to defer X" without a revisit date is a polite no — the topic resurfaces later as a fresh debate. "We deferred X, revisit 2027-03-01" is a scheduled decision: the debate is pre-paid, and whoever picks it up starts from the recorded reason instead of zero.
And when the revisit date arrives and the answer is still "keep as is"? Log a new line saying so. "Revisited VLAN decision 2026-10-15: still flat, scan-to-email still load-bearing, next look Q2" is a ten-second entry that prevents the eleventh re-debate. Decisions that survive their own review become decisions you stop paying attention to — which is the point.
What gets logged (and what doesn't)
Five triggers always earn a line:
- Spend above your threshold — whatever your delegation matrix says ($200, $500)
- Policy changes — password rules, maintenance windows, on-call rotation changes
- Tool decisions — adopt, reject, or defer. The rejects are the most valuable entries; they kill repeat proposals
- Every deferral — with a revisit date, or it doesn't count as decided
- Accepted risks — "we know the printer VLAN is flat and accept it" is exactly what a postmortem needs to find later
Everything else stays in the task tracker. The test: would someone plausibly re-ask this in six months?
Where it plugs in
- Weekly review (2 min): answer every revisit date that fell due this week
- Postmortems: "what did we know and decide before this?" becomes a lookup, not an argument
- Budget reforecast: the log's tool decisions and spend lines are the change history
- Onboarding: a new hire reads the log in twenty minutes and skips re-opening every old fight
The two failure modes
The museum — entries take ten minutes, the log dies by November. Fix: five fields, one sentence each; link out for detail.
The diary — "discussed backups, good meeting." Fix: reject entries that can't be phrased in the past tense with an owner.
Full template with worked examples and a paste-in CSV starter on the site — link below. Five rows is a working log; the habit matters more than the tool.
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