SIX SIGMA, 6 Sigma principle

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What is the 6 Sigma principle?

If we can measure, we can correct

6 Sigma method offers technics and tools in order to improve drastically capability of processes, while reducing defects at the same time. Originally oriented towards production processes, the method searches for absolute regularity.
Variability is indeed a source of client dissatisfaction.
The customer expects a product with a certain quality, according to a specific standard.
Not being up to guarantee the whole production respecting this standard is particularly costly for the company.

If we can measure, we can improve

In fact, final quality variability is mainly the consequence of components (of the products fabrication) instability, of work procedures imprecision and more globally of processes complexity.

Six Sigma imposes to keep in the limitations by applying the following principle:

If you can measure how many defects you have in a process, you can systematically figure out how to eliminate them and get as close to zero defects as possible.
In other words, to sum up: If it can be measured, it can be corrected. The objective being to refocus the curve on the target.

6 Sigma levels of performance

Six Sigma levels of Performance

In the end, 6 Sigma doesn't allow more than 3.4 defects per million opportunities for each product or service.

Recommended reading

What is Lean Six Sigma? What is Lean Six Sigma?
M.L. George D. Rowlands B. Kastle
Mc Graw Hill

Selection of books about Six Sigma

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