Master Production Schedule
MPSA detailed plan that specifies what end products to build, how many are needed, and when they are needed.
The Master Production Schedule (MPS) is a statement of production for individual end products. It breaks down the aggregate production plan into a line-by-line schedule for each specific stock-keeping unit (SKU). The MPS sets the quantity of each item to be produced in a given time period, such as a week or a month.
It works by balancing supply and demand. The MPS uses inputs like sales forecasts, customer orders, safety stock requirements, and current inventory levels. It then considers production capacity, including labor and machine availability. The output is a realistic schedule that manufacturing can execute. This schedule becomes the primary input for Material Requirements Planning (MRP), which calculates the raw materials and components needed to meet the MPS.
On the shop floor, the MPS creates stability and predictability. It prevents frequent changes to production priorities, which can cause material shortages and inefficient changeovers. Supervisors use the MPS to plan labor assignments, machine usage, and workflow. It helps align the entire production team on what needs to be built and by when, improving on-time delivery performance.
Manufacturers typically implement and manage the MPS within an Enterprise Resource Planning (ERP) system. The process requires close collaboration between sales, planning, and production departments. The schedule is often managed using time fences. These are defined periods, such as a 'frozen' zone where no changes are allowed, a 'firm' zone where changes require approval, and a 'flexible' zone where adjustments are permitted.
A bicycle manufacturer's MPS shows a requirement to produce 250 units of the Model X mountain bike in week 15. This plan directs the purchasing team to ensure frames and components are available. It also informs the assembly line supervisor to schedule enough staff and resources for that week's production target.
What is the difference between an MPS and an MRP?
The MPS plans for finished goods or end products. The Material Requirements Planning (MRP) system uses the MPS as an input to calculate the specific raw materials and components needed to produce those finished goods.
How often should a Master Production Schedule be updated?
Most manufacturers update their MPS on a weekly basis. The frequency depends on the industry, product lead times, and the volatility of customer demand.
What are time fences in an MPS?
Time fences are rules for managing changes to the schedule. A 'frozen' fence near the current date restricts changes, while a 'flexible' fence further out allows for adjustments based on new forecasts or orders.
Who is responsible for creating and maintaining the MPS?
A master scheduler or production planner typically owns the MPS. This role requires collaboration with sales, marketing, and operations to ensure the plan is both accurate and achievable.
Can a small job shop use an MPS?
Yes. While often associated with larger operations, a simple MPS in a spreadsheet can help a small shop manage capacity, plan material purchases, and communicate priorities effectively.
Material Requirements Planning
MRPMaterial Requirements Planning (MRP) is a system that calculates the materials and components needed to manufacture a product based on production schedules.
Demand Planning
Demand planning is the process of forecasting future customer demand for products to guide production and inventory decisions.
Production Planning
Production planning is the process of deciding what to produce, in what quantity, and when, to meet customer demand using available resources.
Enterprise Resource Planning
ERPEnterprise Resource Planning (ERP) is a software system that integrates a company's core business functions into a single, shared database.
Sales and Operations Planning
S&OPSales and Operations Planning (S&OP) is a management process that aligns a company's sales forecasts with its production, inventory, and supply chain plans.