The MPS as a Production Commitment

The closer a requirement gets to the factory, the more expensive a casual change becomes. That is why I find it useful to think about the Master Production Schedule as the line between planning intent and factory commitment. At forecast level, a new signal is information. Inside the near-term production horizon, the same signal may require material checks, rough-cut capacity review, changes to planned or released orders, and a decision about which customer commitment the team is still protecting. A stronger MPS review makes four things explicit: - which item is affected - what quantity is moving - which period changes - whether the line is planned, firm, or already released And then it applies a different level of control depending on where the change sits. Firming converts planned orders into actual production or purchase orders. The exact configuration will vary between systems and businesses, but the operating principle is the same: the closer the plan gets to execution, the more deliberate the change needs to become. The MPS is not the detailed production sequence either, it does not decide every machine slot or changeover. It creates the item-time commitment that material planning, capacity checks, production orders, and detailed scheduling can work from. So when demand moves, the useful conversation is not only "can we change the plan?" It is: - What exactly are we changing? - What has already been protected or firmed? - Which material, capacity, order, or customer commitment moves with it? - Who owns the exception? Protected does not mean impossible to change, it means the business understands that responsiveness has a cost, and the trade-off should be visible before the schedule moves. When demand changes inside your near-term horizon, who owns the decision to change the MPS?