Japanese term for a “Lamp” or signal.  In ancient Japan paper lanterns were used as flashlights or a signaling devices.  In modern factories Andon lights are used to indicate that some aspect of the process needs attention. They can reflect potential quality problems identified by an operator or the need for materials replenishment. Often the different color lights are associated with a particular sound.  Common color codes are:

Green – normal operations

Yellow – planned changeover or scheduled down time

Red – abnormal condition, machine down

The term Andon has also been associated with the use of Andon information boards. These boards notify the production team of current production data such as units completed and number of defects.