Seven Days To Find The Flaw In Your
Own Thinking.
Lock in your gut answer, then spend the week testing what it's hiding.
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Confirmation bias runs on your brain's fast system, the one that reaches for a coherent story before your slower, more deliberate thinking gets involved. Once that story starts to form, usually from the first piece of evidence you meet, your mind stops hunting for reasons it might be wrong and starts hunting for reasons it's right. That search feels like rigour, though it is the opposite.
For a leader, this shows up as false thoroughness. You pull the numbers, build the case, and present it with real confidence, because every piece of evidence you gathered happened to point the same way. The gap isn't a missing step in your process; it's a missing question.
Confirmation bias is a close cousin of other cognitive traps, though it works differently from each. Survivorship bias, for instance, doesn't hunt for confirming evidence at all: it simply never notices the failures that got filtered out before the evidence reached you. Confirmation bias is more active, since you stop looking once you already have enough evidence that agrees with you.
The practical tell is speed. A decision that reaches certainty unusually fast, with no dissent in the room and no counter-evidence anyone raised, is worth a second look before it becomes final. If nobody had to work to defend it, nobody has tested it yet.
I once watched this play out over the price of a Nokia car charger. We wanted to move it to £14.99, and Rod's pushback came fast: "Benchmark it against every other retailer. It won't sell at that price." The hunch had already formed, so every comparison that followed only tested price. Nobody asked what a driver with a flat phone at a motorway service station actually has: no alternative, and £14.99 to solve the problem right now. The bias wasn't in being wrong about competitor prices: it was in never asking whether price was the variable that mattered at all.