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Bottom-up replanning is used in computerized MRP systems to solve material availability problems. The planner, rather than the computer system, performs manual bottom-up replanning. The planner uses pegging data and evaluates effects of possible solutions. Pegging refers to the capability in MRP and MPS to identify the sources of an item's gross requirements (demand) or allocations. Possible replanning solutions could include lead time compression, reducing order quantities, substituting materials, or changing the master production schedule.

See Master production schedule (MPS); Material requirements planning (MRP); Pegging.