Andon is one of the most powerful tools in the Toyota Production System. In most non-Toyota factories, it is an expensive light installation that operators learn to ignore.
The andon system is one of the most recognisable elements of the Toyota Production System. When a problem occurs at a workstation, the operator activates the andon — a signal that alerts the team leader, triggers a swift response, and if the problem is not resolved within a defined response time, stops the line.
The concept is simple and powerful. The implementation in non-Toyota environments is consistently problematic. The most common outcome: the andon system is installed, operators are trained, and within three months, activations have dropped to near zero — not because problems have stopped occurring, but because operators have learned that activating the andon is not worth the consequences.
Operators Are Discouraged from Activating
In Toyota, activating the andon is a respected act — it surfaces a problem, contributes to quality, and triggers a support response. In many Malaysian factories, activating the andon is experienced as triggering a blame response. Who caused the problem? Why did this happen? Why is the line stopped?
Operators who experience activation as the beginning of an interrogation will stop activating. This is a rational response to the incentive structure they are operating in — not a training failure or a discipline failure. It is a management culture failure.
Response Times Are Too Long
Andon is designed for rapid response — team leader response in under 60 seconds in high-functioning implementations. In most factories, the response time is measured in minutes. Operators who need help and receive it five minutes later — after their frustration has peaked and the immediate moment of the problem has passed — learn to solve problems themselves rather than wait for a response that arrives too late to be useful.
Long response times are usually a staffing problem: not enough team leaders covering enough production area, or team leaders who are occupied with administrative tasks rather than being present on the floor. Andon requires that someone is always available to respond. If that condition cannot be met, the andon system cannot function.
The System Has No Authority to Stop Production
In Toyota, the andon has the authority to stop the production line. In many factories, the fear of production stoppage means that operators are explicitly or implicitly told not to stop the line — only to signal for help, which may or may not arrive before the problem becomes a defect.
An andon system that cannot stop production is not an andon system. It is a help request button. It does not prevent defects from being produced. It does not change the fundamental quality accountability of the system. It is a more expensive version of raising your hand.
What a Functioning Andon System Requires
Three non-negotiable conditions: a management culture where activation is treated as a positive contribution rather than a problem source; response times that are measured, targeted, and consistently achieved; and the genuine authority to stop production when the problem cannot be resolved within the response window. Remove any one of these and the system will not function as designed.