The Six Sigma Quality Level

According to Harry and Schroeder,1 Six Sigma quality fundamentally means a breakthrough strategy that can be interpreted as “a disciplined method of using extremely rigorous data gathering and statistical analysis to identify the sources of errors and ways of eliminating them.” Sigma is a letter in the Greek alphabet used by statisticians to measure the variability in any process. Most commonly, it represents standard deviation, a statistic for measure­ment of dispersion, i.e. spread about a mean or target value. A simple comparison of this dispersion2 is given in Table 7.1. Six sis about 20,000 times better than three s An impor­tant aspect of the Six Sigma programme is total process characterization, which involves optimizing all processes to a very high Cp and Cpk value. In fact, Six Sigma represents a near defect free situation or precisely 3.4 defects per million opportunities (Cp = 2.0, Cpk = 1.5).

Source: Poornima M. Charantimath (2017), Total Quality Management, Pearson; 3rd edition.

2 thoughts on “The Six Sigma Quality Level

  1. Mariah Lofton says:

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