Six Sigma Manufacturing Example

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Marten van der Zee
Analyst, Netherlands

Six Sigma Manufacturing Example

Businesses who are not very active in quality management most of the time have a process quality from 2 or 3 sigma. This means a failure of about 66.700 products per million opportunities. At first sight, this looks really nice.
But let's look at a product that is built in 10 production steps. In every phase the amount of good products decreases:
- After 2 production phases: 870.862.
- After 4 production phases: 758.401.
- After 10 production phases, there are only 500.895 good products left. Surely this is normally unacceptable...
If you can achieve a sigma of 5, after the 10 production phases the amount of good products would still be 997.702.
The rejected products went down from 49,9% to 0,23% per one million opportunities. This example shows that such businesses should aim at a sigma from 5 or six... And also that the more production steps you have, the more this demands from your sigma level.

  Helen Cass
Management Consultant, United Kingdom
 

Six Sigma for the Software Industry

Can anyone recommend a good book or web-source con (...)

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