Tuesday, September 6, 2011

Sigma Performance Levels - One to Six Sigma

When learning about Six Sigma, it may help to consider these charts, which detail how sigma level relates to defects per million opportunities (DPMO), and some real-world examples.

Sigma Performance Levels - One to Six Sigma
Sigma Level Defects Per Million Opportunities (DPMO)
1 690,000
2 308,537
3 66,807
4 6,210
5 233
6 3.4

What Would This Look Like In The Real World?

It's one thing to see the numbers and it's a whole other thing to see how it would apply to your daily life.

Real-world Performance Levels
Situation/Example In 1 Sigma World In 3 Sigma World In 6 Sigma World
Pieces of your mail lost per year [1,600 opportunities per year] 1,106 107 Less than 1
Number of empty coffee pots at work (who didn't fill the coffee pot again?) [680 opportunities per year] 470 45 Less than 1
Number of telephone disconnections [7,000 talk minutes] 4,839 467 0.02
Erroneous business orders [250,000 opportunities per year] 172,924 16,694 0.9

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