... of outputs of a process and helps us to understand how far the process deviates from perfection. A defect is a measurable characteristic of a process or output that does not conform to specifications or requirements. As we can see different sigma represents different number of defects. For example one sigma level represents 691,462.5 defects on million possibilities. Actually this means 30.9% of non defective output. If for example process performed at 3 sigma level it will perform 66,807 errors per million outputs or 93.3% of not defective outputs. Table below represents number of defective outputs per 1 million outputs at different sigma levels of quality. Sigma level Number of defects per 1 million output 1 ? 691,462 2 ? 308,538 3 ? 66,807 4 ? 6,210 5 ? 233 6 ? 3.4 7 ? 0.02 Now we can see what it means for example if health care organization would have defection level of 2 ? or if aircraft engines producer would operate at 3 ...

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