Queueing idle time

It might be asked why a service system could not be balanced so that there are no idle key resource and no customer queue. The answer is that if cns-tomers are never kept waiting there has to be spare resource, or if resources are to be fully utilized with no idle time, there must be a store of customers. Occasionally a balanced system might exist but this will be for a short period of time. 

Kanban It is a Japanese word for card. The basic kanban system is to use cards to trigger movements of materials between operations in production so that a customer order flows through the system. Computer systems eliminate the need for cards but the principle is the same. As a job flows through the factory, completion of one stage of production triggers the next so that there is no idle time, or queues, between operations. Any one job can be tracked to determine the stage of production. A Kanban is raised for each customer order. The kanban system enables production to be in batches of one. 

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