Six Sigma

Six Sigma is a methodology containing tools and techniques to improve business processes. It was first used by Motorola and has since been implemented successfully by most large corporations.

It is focused on reducing variation and defect reduction and is more dependent on accurate data than lean management.

The name comes from statistical quality control and is used to refer to processes that are 99.999966% free from defects or 3.4 defects per million opportunities.

There are two main Six Sigma methodologies


This is generally used for improving an existing process.


This is aimed at new products, services or designs. It is also called Design For Six Sigma (DFSS).

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