The master production schedule, almost always called the MPS, is a term that appears whenever production planning is discussed and is rarely explained plainly. This piece explains what an MPS is and the specific role it plays in planning a manufacturing operation.
What an MPS is
A master production schedule is a statement of what finished products a manufacturer intends to produce, in what quantities, in which time periods. It is usually laid out as a grid: products down one side, time periods, often weeks, across the top, and a planned quantity in each cell. That is the whole idea. The MPS is the plan for what comes off the end of the line, period by period.
Where it sits
The MPS sits in a specific and useful place: between raw demand and detailed material planning. On one side is demand, sales orders and forecasts, which is messy, uneven, and not directly producible. On the other side is MRP, which needs a clear statement of what to build before it can work out the components. The MPS is the bridge. It takes demand and turns it into a deliberate, sensible plan of finished-goods production, which MRP can then explode into requirements.
That bridging role is why the MPS matters. Without it, MRP would be planning directly against raw demand, with all its lumpiness and uncertainty. The MPS is where a planner smooths and shapes demand into something a factory can actually build.
What the MPS lets a planner do
Because the MPS is the layer where production is shaped, it is where judgement is applied. A planner can level production, spreading output evenly instead of chasing every peak and trough in demand, which keeps the floor stable. A planner can decide how much to build to forecast ahead of confirmed orders, balancing the risk of holding stock against the risk of being unable to deliver. And the MPS makes those decisions explicit and visible, rather than leaving them implicit in a spreadsheet only one person reads.
MPS and MRP: the difference
The two are constantly confused. The MPS is the plan for finished products: what to ship, what to complete. MRP is the calculation that takes the MPS and works out the components and materials needed to achieve it. The MPS is the input; MRP is the engine that acts on it. Put simply, the MPS decides what to build, and MRP decides what to buy and make so that you can build it. One does not replace the other; MRP needs an MPS to act on.
The MPS in a manufacturing ERP
In a manufacturing ERP, the MPS is not a separate spreadsheet a planner maintains by hand. It is a connected part of the system: it draws on the demand the ERP already holds, the planner shapes it, and it feeds straight into MRP, which is also part of the system. Because it is connected, when demand changes the planner sees it against the MPS, and when the MPS changes MRP re-plans from it. The MPS becomes a live planning surface rather than a static document.
The short version
The master production schedule is the deliberate plan of what finished goods to produce and when. It bridges messy demand and the precise calculations of MRP, and it is the place where a planner applies judgement to shape production into something stable and achievable. For how we approach manufacturing planning, see our manufacturing work.