The function of this system/module is to help the master scheduler develop a realistic production schedule that provides a level plant load. This helps to develop a plan of resources and compares it with the resources available. As a result, inventory investment can be minimized by matching the master production schedule to actual and forecast demand. Customer service can be increased by providing accurate, time-phased production that becomes available as promised. Critical resource availability against requirements can be monitored to ensure that the production plan is realistic.

In the capacity requirements planning (CRP) system, some interactions can be identified. To cite an instance, work order control and production activity control provide the time phased work order input needed to project the work centre load from work-in-process. In addition,the planned order input for manufactured MPS items in CRP is supplied by the master scheduling. On the other hand, the material requirements planning module provides the planned order input for manufactured items from regenerative or net change MRP schedules.