The Illusion of DQ

Definition

The illusion of DQ is the megabias in which people believe their decisions are far higher quality than they actually are, because they rate their overall satisfaction with a decision instead of scoring each of the six DQ requirements independently. Since decision quality equals the weakest link, not the average or the overall "feeling" of confidence, the gap between perceived and actual quality can be large — and it is largest for exactly the decisions where people feel most confident, including senior executives who assume their leadership position proves their decision-making instincts.

In the Book

The book's clearest evidence comes from the Decision Education Foundation's training simulation: teams of five or six watch a video decision scenario, decide what to do, and rate their decision's quality — invariably 70-90%, averaging 80%. Only after being taught the six DQ requirements and asked to rate each one separately does a much lower number emerge, "typically around 25%" on the weakest requirement. Since overall quality is set by the weakest link, the true DQ is 25%, not 80% — a 55-point illusion. The book stresses this isn't confined to teenagers in a training exercise: "it is regularly observed among executives who make multimillion-dollar decisions," many of whom assume they were promoted because of superior natural decision-making ability, then reinforce the illusion afterward with confirming evidence and hindsight rationalization.

Why It Matters

This exposes a specific failure mode of self-assessment: a single holistic confidence rating hides component-level weakness that a decomposed rating exposes immediately. The fix generalizes beyond decisions — any time a global "how good is this" judgment is available, decomposing it into its independent load-bearing parts (and taking the minimum, not the average) will surface problems a gut check misses, especially in domains where the assessor has authority and therefore assumes competence.