An Andon is a manufacturing term referring to a signal used to alert people to a problem with a process or an issue with quality. And Andon system is designed to stop production when a defect arises, and work is stopped until the issue is fixed. Andons are an important element of Jidoka, the component of the Toyota Production System that means automation with a human touch. The goal of Jidoka is to improve quality, and an Andon is a signal that can identify quality problems right away. Although developed by Toyota, the Andons have become common in Lean manufacturing.
Andons come in several forms. The original concept was called the Andon Cord and like the name suggests, It was a rope located above the manufacturing line that was pulled to activate the Andon. Modern versions of the Andon however, are typically activated automatically. For example, a light post with a green, yellow, and red light that changes color when a problem arises is an Andon. Electronic Andons can display the state of current processes on a screen, and images or text can change color. Some Andons can even have audio elements that play coded tones with different tunes used for different alerts.
Any signal that is triggered by a process issue is some kind of Andon, common triggers include part shortage, defects, tool malfunctions, and safety problems. When workers hear or see the Andon alert, production is stopped before any other issues happen, and assistance is called over to address the problem. Using am Andon system will result in better quality products, an efficient production line, and reduced downtime. Additionally, Andon alerts can be recorded to help managers identify areas of improvement in their facility.
In daily life, many Andons exist outside the workplace, too. When the fuel warning light comes on in a car, that's a signal to refill the vehicle's gas tank so the process of driving can continue. If someone leaves the refrigerator door open in the kitchen, some fridges will start beeping to alert people to take action and close the door.