Aggregate Planning vs Master Production Schedule: What Manufacturers Should Know

A manufacturer can have a sales target for the quarter and still not know what to produce next week. That is the difference between high-level planning and execution planning. Aggregate planning and the master production schedule both matter, but they answer different questions.

Aggregate planning looks at capacity, demand, labour, inventory, and production output at a broader level. The master production schedule, or MPS, converts that direction into a more specific plan for what products need to be made and when.

For manufacturers using AICAN Optiwise, the value comes from connecting both levels with real data: demand, BOM, MRP, inventory, purchase, routing, and production status.

What Is Aggregate Planning?

Aggregate planning is a medium-term planning process. It usually looks at product families, overall demand, capacity, workforce, shifts, inventory, subcontracting, and production volume over weeks or months.

It does not usually decide every finished product quantity at detailed SKU level. Instead, it helps management decide whether the business has enough capacity to meet expected demand and what broad actions are needed.

For example, a business may decide to increase shifts, build stock before a seasonal peak, outsource a process, or level production across months.

What Is Master Production Schedule?

The master production schedule is more detailed. It translates demand into a time-phased production plan for specific finished goods or major assemblies. It helps answer what should be produced this week, next week, or during a defined planning bucket.

The MPS sits closer to execution. It guides MRP, purchase planning, work order release, and production priorities.

Key Difference

Aggregate planning answers: Do we have enough overall capacity and resources to meet demand?

Master production schedule answers: What specific products should we make, in what quantity, and when?

Aggregate planning is broader and longer-range. MPS is more specific and closer to production execution.

How They Work Together

Aggregate planning gives direction. MPS converts that direction into a production plan. MRP then uses the MPS, BOM, inventory, and lead times to calculate material requirements.

If aggregate planning says demand will rise next month, the MPS must translate that into actual product schedules. If the MPS is created without aggregate capacity awareness, it may overload the factory.

Common Mistakes

The first mistake is treating aggregate planning as a rough sales forecast only. It should consider capacity and supply constraints. The second is making an MPS without checking material and capacity. The third is changing the MPS too often without understanding the impact on purchase and production.

Planning must be connected, or each layer creates a different version of reality.

Where Optiwise Helps

AICAN Optiwise helps manufacturers connect demand, BOM, MRP, inventory, production planning, routing, and purchase. This helps planning move from broad demand assumptions to executable production decisions.

The system supports the discipline needed to turn a business plan into factory action.

Founder’s Note

At AICAN, we believe planning should move smoothly from strategy to shop floor. A monthly plan is useful only if it can become weekly production, material readiness, and dispatch confidence. Optiwise is built to help manufacturers connect those layers.

FAQs

What is aggregate planning?

Aggregate planning is medium-term planning for overall demand, capacity, inventory, and production output.

What is a master production schedule?

MPS is a detailed time-phased plan for specific products and quantities to be produced.

How are aggregate planning and MPS different?

Aggregate planning is broader and longer-range. MPS is more specific and execution-focused.

Why should ERP connect both?

Because demand, capacity, inventory, purchase, and production must align for the plan to be realistic.

Where can I learn more?

Visit AICAN Optiwise and About AICAN.