Usually, control parameters of paper machines are fixed to the same values as optimized when a QCS is first introduced using a typical product, even when producing other similar grades. Recently, many paper machines are operated in a high-mix, low-volume condition because of the consolidation of equipment and diverse products to satisfy the requests of end users. Furthermore, stable operation of the paper machine is often disturbed by the feed preparation process and/or by auxiliary systems. Stable control of this process and equipment is another important reason why control parameters must be optimized. The control parameters need to be monitored and optimized every 1 to 2 years to meet these challenges and thus control product quality, reduce feed costs and curb emissions