Abstract
The combination of tree multivariate techniques (Principal Component Analysis, Cluster Analysis and Discriminant Analysis) may be used to isolate and determine bounds for the critical control variable in a ``black box'' type industrial process. If input samples can be grouped into homogeneous quality categories, then it may be possibie to use input and operating data to estimate discriminant functions which will differentiate between various quality categories. These functions could then be used to predict quality levels based upon input and operating characteristics. In addition, the coefficents of te discriminant functions would provide information as to the critical control variables and their bounds.
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