Six Sigma

From GAWDAwiki

Six Sigma is a quality management and process improvement methodology particularly well-suited to process-intensive industries like manufacturing. Six Sigma measures a given process by its average performance and the standard deviation (or variation) of this performance, aiming to reduce the occurrence of defects in a given process to a level of “"Six Sigma" outside the norm; no more than 3.4 times per million.^[1]

References

1. http://www.issel.co.uk/resources/pm_glossary.htm