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 Calculating the Capacity Requirements of an Activity

Use

The capacity requirement of an activity describes how much of the productive time and the capacity of a resource is required to process the activity. Since various resources may be necessary to perform an activity, there may be several capacity requirements for an activity (one for each resource in the mode ). Thus, each capacity requirement is determined through the net duration and the corresponding resource consumption of the activity.

The system calculates the net duration, the resource consumption and thus the capacity requirements of an activity:

  • When it explodes the source of supply for in-house production; in other words

    • When an order is created

    • If the order quantity is changed

    • If the order date/time is changed so that the in-house production source of supply is no longer valid (see Considering Order Validity )

  • When you confirm an operation

    Here the system determines the capacity requirements for the remaining quantities.

Integration

During detailed scheduling , the system determines the mode and the scheduling date for an activity on the basis of the capacity requirements and the desired scheduling date. In the process, the system takes into account the fact that the resources are not available continuously (for example, due to breaks) and that the rate of resource utilization can deviate from 100 percent. For this reason, the gross duration of the activity (that is, the time-span between the start and end dates/times) can differ from the net duration. The key factors for scheduling are the working time data and the rate of resource utilization (described as calendar resource in the mode).

In the case of finite scheduling , you can only schedule an activity in sufficiently long time intervals , in which enough capacity is simultaneously available at all resources necessary to carry out the activity. In the case of infinite scheduling, the system does not take the limited capacity of a resource into account. An activity can therefore be scheduled for any dates/times, irrespective of resource consumption.