Abstract
One of uncertainties in system design is the inevitable estimated error of system parameters. The experimental conditions spherizing the parameter confidence region and minimizing the volume of the parameter confidence region have been proposed to obtain more accurate estimation of parameters. In this paper, a practical method is proposed based on the concepts of the parameter confidence region and its sensitivity to process design. This method can lessen the influence of estimated error of parameters on process design. An example explains the usefulness of this method.