Constable, Gordon K.; Yen, Vincent (1988, ASQC) Wright State University, Dayton, OH
During WW II the US Government required the use of statistical quality control techniques by the producers contracting with the government. However, with the huge pent-up consumer demand at the end of WW II and the reduced reliance on government contracts, many producers promptly dropped or relegated to a minor role in their statistical quality control efforts. Since the resurgence of Statistical Process Control via the Japanese, there has been a renewed interest in advanced statistical charting techniques. This paper looks at a technique which can be used to control more than one quality characteristic fon a single chart or to control more than one measurement at different locations for a single quality characteristic. The technique is investigated for its applicability under various levels of correlation between the quality characteristics.