This contains repair parts such will either be stocked in the service department of companies or send directly to the customer.
Proportion in all categories varies for various companies, and in several cases one or more categories are removed. Companies generating assembled products commonly handle all the three types. Several companies exclude the third category as it does not present end products.
The Master Production Schedule is generally considered to be a medium-range plan as it contains into account the lead times to order components and raw material, produce parts in the factory, and after that assemble the conclude product. The changes are not permitted inside about a six week horizon due to the complexity in adjusting production schedules inside such a short period. Though, schedule changes are permitted beyond six weeks to cope along with changing demand patterns or the introduction of innovative product.