Decision-making under uncertainty means choosing a course of action when information is incomplete, outcomes are difficult to predict, or conditions may change. Rather than waiting for a perfect forecast, decision-makers compare available options, assess risks, and act on the best evidence they have.
In cybersecurity, this is essential because defenders often must respond before an investigation is complete-for example, deciding whether to isolate a device after suspicious activity or how to prioritize vulnerabilities with unclear exploitability. Attackers also exploit uncertainty through ambiguous alerts, changing tactics, and incomplete information. Clear priorities, documented assumptions, and plans that can adapt as new evidence emerges help organizations make timely choices without treating guesses as facts.