A Forecast Is More Useful With a Review Trigger

A planning lesson: a forecast is easier to learn from when its assumptions travel with it. A launch estimate, for example, may depend on a supplier date, a staffing decision, or an unresolved approval. If those assumptions stay implicit, a changed outcome can look like a surprise rather than information.

A practical habit is to record three things beside a forecast: the key assumption, an observable signal that would challenge it, and the date or event that should prompt a review. That doesn’t make the forecast certain. It makes uncertainty usable: the team can revise the plan when the evidence changes instead of defending an old estimate—or reopening every question at once.

The useful test is not only “Was the forecast right?” but “What did we learn about the assumptions that shaped it?”