Master production scheduling (MPS): is the disaggregated form of the SOP. This means that the SOP is broken down from high-level measures like product families into the detail of skus by major production facility. The MPS is the link between front end and engine of the MPC system. On the one hand, it receives SOP data about sales and forecasts. On the other hand, it feeds data back to SOP on orders and stock replenishment status so that customers and distribution can be kept up to date. The MPS handles the detail of what is planned and what is happening. For MTS environments, the priority is inventory management: for MTO environments, the priority is timely execution of all of the processes from design through to delivery.