What is a Master Production Schedule (MPS)? Definition & Manufacturing Examples

What is a Master Production Schedule (MPS)?

The Master Production Schedule is a high-level production plan that specifies which finished products will be manufactured, in what quantities, and during which time periods. The MPS translates sales demand — a combination of firm customer orders and demand forecasts — into a concrete production plan that drives all downstream planning activities. It is one of the most important planning documents in any manufacturing operation.

How the MPS Works in Manufacturing

The MPS sits at the top of the planning hierarchy. It takes inputs from sales (customer orders), marketing (demand forecasts), and inventory management (stock targets and safety stock requirements), then generates a time-phased plan for finished goods production.

The MPS planning horizon typically extends 3 to 6 months, broken into weekly or monthly time buckets. Near-term periods (the next 2 to 4 weeks) are driven primarily by firm customer orders. Further-out periods rely more heavily on forecasts. This mix of firm and forecast demand allows the MPS to provide both commitment accuracy for near-term production and visibility for longer-term material procurement and capacity planning.

Once established, the MPS feeds into Material Requirements Planning (MRP), which explodes the finished goods plan into component and raw material requirements. It also feeds into capacity requirements planning, which checks whether sufficient machine and labor capacity exists to execute the plan. If capacity is insufficient, the MPS must be adjusted.

The MPS is not a static document. It is reviewed and updated weekly as new orders arrive, forecasts change, and production results come in. The goal is to maintain a stable near-term plan (to avoid disrupting shop floor execution) while adjusting the longer-term plan to reflect changing conditions.

MPS Example

A manufacturer of industrial valves creates a weekly MPS for three product families:

Weeks 1 and 2 are frozen — changes require management approval because materials are already committed and capacity is allocated. Weeks 3 and 4 are firm but adjustable with planner approval. Weeks 5 through 12 (not shown) are flexible and driven primarily by forecast.

Rough-cut capacity planning shows that Week 2 exceeds machining capacity by 40 hours due to the combined gate and ball valve requirements. The planner adjusts the MPS, moving 50 ball valves from Week 2 to Week 3, bringing the plan within capacity limits.

Why the MPS Matters for Production Scheduling

The MPS is the starting point for all detailed scheduling. A well-managed MPS provides a stable foundation that allows finite capacity scheduling systems to generate reliable shop floor schedules. An unstable MPS — one that changes frequently in the near term — creates chaos downstream as schedules, material commitments, and capacity plans constantly shift.

Tools like Resource Manager DB (RMDB) work downstream of the MPS, taking the planned production quantities and scheduling the specific operations across machines and work centers. The accuracy of this detailed schedule depends directly on the quality of the MPS feeding it.

Related Terms

• Capacity Planning — The process of validating whether sufficient resources exist to execute the MPS
• Scheduling Horizon — The time period covered by the MPS and detailed schedules
• Operations Scheduling — The detailed scheduling of individual operations that executes the MPS plan

Frequently Asked Questions

Learn more in our complete manufacturing glossary or production scheduling guide.