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Andons are used in Lean Production. The term refers to the use of lights as visual signals. Lights with three colors, red amber and green are often used. Green is normal operations, amber means routine action required, red means abnormal action, immediate attentions.
For example an andon might be used to trigger material replenishment. Green means no action, amber means time to replenish and red means stockout, immediate action required.
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