A recommendation that lives only in the room dies when the room empties. People remember the gist, the gist drifts, and within a fortnight the decision everyone agreed to has quietly become three different decisions in three different memories. The cure is an artefact — small, owned, on the record — and the artefact is the proof that a decision was actually made rather than merely discussed.
The decision memo is that artefact, and its discipline is compression. It is the one page that survives the meeting. Not the eighty-page document that performs rigour while deciding nothing — its opposite. The decision memo states, in the smallest form that closes the question: the decision being recommended, the reason it matters now, the options considered and rejected, the cost and the trade-off named plainly, the risk and who owns it, and the single clear recommendation with a name attached. If it cannot fit on a page, the thinking is not finished. The page is not a summary of the work. The page is the decision, and everything longer is supporting material the decision can stand without.
The discipline of the page is the discipline that produced it. Everything earlier in the instrument now pays out here. The room-reading told you which objections were coming; they are answered on the page before they are raised. The lenses told you what each seat needed to see; the page carries all of it, compressed. The rehearsal found where the recommendation bent; the page is the version that stopped bending. The memo is not a separate skill bolted on at the end. It is the loop’s residue — the single artefact in which orienting, framing, pressure-testing, and refining leave a mark a stranger can read.
What the memo does that the meeting cannot is hold under absence. The recommendation has been rotated through the lenses, so each objection it will face is already answered in a line the reader can quote. The risk is owned by a named person, so it cannot drift into the unowned middle where nothing is anyone’s. The trade-off is stated, so no one can later claim the cost was hidden from them. A decision recorded this way can be challenged — but only by engaging it. Superseded — but only by a new decision someone owns. Never quietly disregarded, because the page exists and shows who stood behind it.
See it leave the room. The presenter does not gather their slides and promise to circulate notes. They put a single page on the table — here is the decision, here is who owns the risk, here is what we are trading away, here is my recommendation — and they ask the room to mark it agreed, amended, or declined. The room cannot retreat into comfortable vagueness, because the page will not let it. Either the decision is made and recorded with a name on it, or the absence of a decision is now visible to everyone, which is its own useful result. The page forces the ambiguity to expire. That is the whole of its function.
This is the output the rehearsal exists to produce. You orient, you frame, you pressure-test, you refine — and what you carry out of the room is not a feeling that it went well but a defended recommendation on a single page, owned by name. The decision memo is the held line made portable: a call that can survive the room emptying, the memories drifting, and the first person who, a month later, would prefer it had never been made.