The document
What a written recommendation contains
Every paid engagement ends with a document a director can reuse. It names the question we were asked, the evidence we used, the limits of that evidence, and the one action we recommend. It also names the costs of that action in money, time and attention, and the costs of leaving the current path alone. If we believe two paths are still reasonable, we still choose one and write why. Annexes hold tables and extracts so the main argument stays short enough to read before a board meeting. We do not deliver a slide deck as a substitute for this note. Slides can follow if you need them for a specific audience, and they will point back to the same sentences.
The document is dated. If the facts change, the date tells a later reader that the argument has a life span. Standing advisory exists partly so that date does not become an excuse to ignore the original recommendation, and partly so that we can revise it in writing when the facts have actually moved.