Quality Control by Prevention: A Field Study of An SPC and DOE Implementation


Sjoblom, Leif   (1996, Marcel Dekker, Inc. and ASQC)   IMD Lausanne, Switzerland;

Quality Engineering    Vol. 9    No. 1
QICID: 15089    September 1996    pp. 51-63
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Article Abstract

[This abstract is based on the author's abstract.]

A quality improvement project at SuperChip, a disguised Fortune 500 firm, is described. The existing appraisal-based quality control system found many defects but did not succeed in prescribing preventive actions. The firm implemented new Statistical Process Control (SPC) system to overcome limitations in the old system. At the same time, a Design of Experiments (DOE) project was implemented and evaluated. Three approaches to quality control are contrasted. These are inspection, SPC, and DOE. The quality improvement project focused on identification and elimination of defects caused by workers, while the DOE approach resulted in significant quality improvement. The results could be attributed to a large degree to very specific circumstances, however. On the basis of the field study, general implications for preventive quality control are described. Subsequent research will test and validate these conclusions on a broaderindustry-wide scale.


Case study,Design of experiments (DOE),Taguchi method,Quality control (QC),Statistical process control (SPC),Electronics industry

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