Part Two · Develop Expertise

When You Don’t Have All the Facts

Waiting for certainty is a decision that is rarely the right one.

In brief

Waiting for certainty is a decision, and rarely the right one. The chapter covers scenario thinking, making assumptions explicit, matching deliberation to reversibility, and setting triggers to recalibrate.

What the chapter covers

Three Environments, Three Different Problems
The Real Cost of Waiting
Scenario Thinking
Making Assumptions Explicit
Reversible vs. Irreversible Decisions
The Recalibration Discipline

Inaction is a decision with costs that are harder to see but no less real than the costs of acting.

Two ways to decide under uncertainty

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Scenario thinking: testing the decision

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Questions for your team

What decision are we delaying while we wait for information that may never arrive?
What assumptions sit under our current plan? Which one is most fragile?
Is this decision reversible? Does the process we give it match the cost of being wrong?
What specific signal would tell us to revisit the decision?

Field Guide Tool #10

The Decision Quality Checklist

Structures decision-making under uncertainty: environment classification, assumption mapping, scenario testing, reversibility assessment, and recalibration triggers.

Best used before committing to any significant decision with incomplete information.

Go deeper

The Checklist Manifesto by Atul Gawande
Sources of Power by Gary Klein