Case Number: 5-104-004, Year Published: 2004
HBS Number: KEL028
Statistical Process Control, Six Sigma Quality
The case assumes an understanding of statistical process control (SPC) and focuses on highlighting why Six Sigma quality is useful. In particular, it takes the issue of a bearing being worn out at a tire manufacturer leading to a mean shift (while producing defectives). In contrast, it is shown how a Six Sigma process would quickly detect the mean shift while producing hardly any defectives. The case may be used to introduce the methodology of statistical process control but is best used to illustrate the value of Six Sigma after students have understood SPC.
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