Pull System

  A pull system is a technique used to produce only what has a demand attached to it.  Pull systems are also used to replace inventory items which may have been taken to fulfill a demand.  Pull systems use triggers to notify individuals when a demand or a need has been generated for the part or service.  

Example:

  One very common everyday example of a pull system is at a grocery store.  Items are not replenished until a customer "pulls" the item from the shelf.

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