The Six Sigma Scale

The Six Sigma scale shows how well a vital feature performs compared to its requirements. The higher the sigma score, the more efficient the feature is. This table shows the universal Six Sigma scale:

Sigma Level (Z)	Defects per Million Opportunities (DPMO)	Percent Defects (%)	Percent Success (Yield %)	Capability (CP)
1	691,462	69	31	0.33
2	308,538	31	69	0.67
3	66,807	6.7	93.3	1.00
4	6,210	0.62	99.38	1.33
5	233	0.023	99.977	1.67
6	3.4	0.00034	99.99966	2.00

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