How to decide with incomplete information

Most important choices arrive before every fact does. Waiting for certainty usually means letting the decision get made for you.

Separate what you know from what you assume

List the facts you have, then list the assumptions you are making. Seeing them side by side shows which unknowns actually matter and which are simply uncomfortable.

For each important assumption, ask what would have to be true for it to hold, and whether there is a quick, inexpensive way to check.

Ask whether the decision is reversible

Some decisions are doors you can walk back through: a pilot program, a short contract, a trial hire. Others are harder to undo. Move quickly on the reversible ones and slow down on the rest.

When a choice is hard to reverse, look for a smaller first step that keeps options open while you learn.

Set a review point

Write down what you decided, why, and what you expect to happen. Then set a date to look back. A short record turns every decision into a lesson, whatever the outcome.

Over time, these notes reveal patterns in your judgment that no checklist can provide.