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?
Why this works
Confident misdiagnosis is where problem-solving actually fails — not for lack of analysis, but analysis aimed at defending a belief. The "how did you find out" clause forces a concrete account instead of a philosophy of humility, and shows whether the candidate tests assumptions or protects them.
Follow-up probes
- 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 certain?
What good looks like
A specific incident with a real cost, told without blame; the signal that broke the assumption named precisely; and a changed habit since — disconfirming checks run earlier, confidence treated as a cue to verify rather than a reason to stop.
Red flags
No example available ("my instincts are usually right"), the error pinned entirely on others or on missing information, or the story stops at the discovery with nothing done differently since.