The pull principle is a concept for the material flow in a production system. It is also known as the fetch principle. In this case, a processing station in a value chain should only perform when this service is requested by the station downstream of it or by a customer.
In production environments, a customer order triggers the manufacture of the product. Subsequent assembly stations request the quantity of parts that they require for production from the previous ones. In this way, extensive warehousing is avoided and the current stock is reduced.
In order to be able to implement the pull principle effectively, the production sequence should be smoothed (Heijunka). The individual stages of production must be synchronized so that an ordered quantity can be delivered precisely.