Master Production Schedule
Is MPS the same as MRP?
No. The MPS defines the planned build schedule for finished goods or critical items; MRP explodes that schedule into dependent demand for components and raw materials.
What inputs are required to create an MPS?
Starting inventory, forecast or demand plan, booked orders/order portfolio, and the quantity to produce in each period; systems may also include safety stock targets and min/max replenishment rules.
What does an effective MPS optimize?
Customer service, inventory and backlog targets, valid order promising, and efficient use of capacity and resources while resolving tradeoffs between supply and demand.
A Master Production Schedule (MPS) is a time-phased, item-level plan stating which finished goods will be produced, in what quantities, and when. It links aggregate sales and operations planning to detailed material requirements planning, converting forecasts, customer orders, and inventory into net requirements and serving as the primary demand signal that drives MRP.
On the shop floor, the MPS becomes a weekly or time-bucketed production plan for specific SKUs, so supervisors know which lines to run, in what sequence, and at what output target. In warehousing, it drives anticipation of finished-goods depletion and replenishment, allowing receiving, putaway, and pick-face restocking to be staged before stock falls below target. For raw materials, the MPS feeds MRP explosion logic, converting scheduled finished goods into component and material demand to support supplier releases, material reservations, and work-order staging. The time-phased master scheduling grid displays forecast, booked orders, projected inventory, and planned production by period, letting planners review supply-demand balance and adjust builds. Operational success depends on keeping production stable and feasible—matching the schedule to actual capacity and material availability rather than reacting to shortages or rush orders.
Forecast error at the item level: An MPS built on a weak forecast leads a plant to overproduce slow movers while starving true demand, creating excess finished-goods inventory, obsolescence, and hidden carrying cost; the reverse causes backorders and missed ship dates.
Capacity-loaded MPS ignoring real constraints: When the schedule assumes output the line cannot physically achieve, MRP still issues material demand that the shop floor cannot convert into finished goods on time, causing WIP congestion, expediting, and unstable changeovers.
Inaccurate inventory and availability mismatch: If on-hand counts, open purchase orders, or work-order receipts are wrong, MPS netting logic produces false signals, triggering component shortages at kitting, stalled receiving or putaway, and line stoppages due to missing raw materials.