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 |
