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DESIGNING A MULTIVARIATE QUALITY CONTROL SYSTEM IN MULTISTAGE PRODUCTION PROCESSES

In most manufacturing environments, when a product is made in sequential stages, not only the quality characteristics of the product in different stages are not independent of each other, but they are not independent in each of these stages either. In this paper, a new procedure based on event-space partitioning method is presented to determine the out-of-control stage(s) of the production. Furthermore, in order to specify the out-of-control factor(s) in the out-of-control stage(s), a new technique based on the principal components and discriminant analysis is developed.