Your question is Rectifying a Major Professional Mistake. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
What is the most significant mistake you have made in a professional setting, and how did you rectify it?
Choose one specific example rather than a minor error or a hypothetical situation. Explain the stakes, your individual responsibility, the actions you took to repair the impact, and what changed afterward. We are looking for ownership without blame, clear communication with affected stakeholders, and evidence that you changed your behavior or process.