A decomposition technique for quantifying real process performance

A decomposition technique for quantifying the impacts of changes in product mix and process performance on aggregate process-related indicators is pre sented. Through application of the technique, the real performance of a pro cess can be quantified. Changes in real performance over time can be monito red to provide useful information for process evaluation and production pla nning. Two case studies, one related to the aggregate defective rate for an assembly line of art integrated circuit fabrication plant and the other to the aggregate inventory turnover for a tyre distribution company, are pres ented to illustrate the application of the technique.