When a problem first occurs on the production line which lean tool illuminates the abnormality by drawing attention to it immediately?

The lean tool that illuminates abnormalities on the production line is the "Andon" system. It typically consists of a visual display, often in the form of lights or signals, that alerts operators and management to issues in real-time. This immediate feedback mechanism helps teams identify and address problems quickly, fostering a culture of responsiveness and continuous improvement. By highlighting issues as they arise, Andon supports efficient problem-solving and minimizes downtime.