Tell me about a time you were confident about the cause of a problem and turned out to be wrong. How did you find out, and what did you do next?

Past behavior in a real situation is a stronger predictor than hypotheticals, and this prompt selects for candidates who test their assumptions rather than defend them. The "how did you find out" clause forces a concrete story instead of a philosophy of humility.

• What evidence first made you suspicious of your own diagnosis?
• What would have happened if you'd been wrong for another month?
• What do you do differently now when you feel that same confidence?

A specific incident with a real cost, told without blame-shifting; the candidate names the signal that broke their assumption and shows a changed habit (e.g., seeking disconfirming evidence earlier).

No example available ("I'm usually right"), the error is attributed entirely to others or to missing information, or the story ends at the mistake with no changed behavior.