The priority that is used to control operations that occur at the same time, and that appropriate one or more operations ...

The priority that is used to control operations that occur at the same time, and that appropriate one or more operations resources at the same time. The priority determines which operation is the primary one. The primary operation should be the operation loading the operations resource that is regarded as the bottleneck for simultaneous operations. A bottleneck operations resource is not defined in any special way in the system, because individual routes and productions determine which operations resources page the bottleneck. An operations resource that is a bottleneck on one route, and therefore defined as primary for simultaneous operations on that route, can be secondary on another route. If the operation is not primary, the times from the primary operation are used to schedule the secondary operation. This means that the times do not have to be specified for secondary operations. If there are no parallel operations for an operation number, the operation should be created as a primary operation.
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