Andon (Visual Management)
Andon is a visual signaling system that immediately alerts the team when an abnormality occurs. It empowers every worker to stop and fix problems before they escalate.
Andon (Japanese: 'lantern') is a visual management tool used to communicate production status in real time. Typically, colored lights or displays show whether a station is running normally (green), needs attention (yellow), or is stopped (red).
The revolutionary aspect of Andon is cultural: Every worker has the authority -- and the duty -- to pull the Andon cord when they detect a problem. The line stops, a team leader responds, and the issue is resolved before defective parts move downstream.
Andon transforms the relationship between workers and management. Instead of hiding problems to keep the line moving, problems are surfaced immediately. Toyota considers each Andon pull a learning opportunity, not a failure.
Modern Andon systems extend beyond lights: Digital dashboards, automated alerts, escalation timers, and response tracking. But the core principle remains unchanged -- make problems visible instantly and respond immediately.
Practical Example
A packaging line installs an Andon system with pull cords at every 3 meters. In the first month, workers pull the cord 47 times. Average response time by team leaders: 90 seconds. By week 4, recurring causes are identified and fixed -- Andon pulls drop to 12 per month, and customer complaints decrease by 35%.
How Leanshift Helps
Leanshift captures process disruptions and downtime events in real time. This data serves as a digital Andon log -- showing when, where, and how often problems occur, enabling targeted countermeasures.
Frequently Asked Questions
Does stopping the line not reduce output?
Short-term yes, long-term no. Stopping to fix problems immediately prevents defects from propagating. Toyota found that Andon increases total output because rework and scrap decrease dramatically.
What if workers misuse the Andon cord?
In a healthy Lean culture, there is no misuse -- every pull is taken seriously. If workers hesitate to pull, that is the real problem. Leaders must reinforce that stopping for quality is expected and valued.
Can Andon work in non-manufacturing settings?
Yes. Software teams use 'build broken' alerts, hospitals use patient safety signals, and service teams use escalation dashboards. The principle of immediate visibility for abnormalities is universal.
Related Terms
Gemba Walk
Gemba Walk means: Go to the actual place to observe processes with your own eyes. Don't optimize from a desk, but where value creation happens.
Poka-Yoke (Error Proofing)
Poka-Yoke is a design approach that makes errors impossible or immediately detectable. It builds quality into the process rather than relying on inspection after the fact.
Jidoka (Autonomation)
Jidoka means 'automation with a human touch' -- machines detect abnormalities and stop automatically. It separates human work from machine work and builds quality into the process.