Six Sigma

Six sigma is quality standard of just 3.4 defects per one million opportunities or 99.9996% perfect.

It is also an improvement methodology that emphasizes mathematical and statistical tools to improve the quality of processes that are already under control. Application follows a five-step process of define, measure, analyze, improve, and control often referred to as DMAIC.

Six Sigma DMAIC - define, measure, analyse, improve, control

Motorola conceived the technique in 1986 as a way to achieve the company’s improvement goals in manufacturing and support functions. The term refers to the number of standard deviations a point is away from the mean point in a bell curve. It often is represented as 6σ.

Many lean thinkers apply six sigma techniques to solve stubborn quality problems in value-adding processes that already are under control and where an analysis of the overall value-stream has eliminated nonvalue-adding processes.

Additional Resources on Six Sigma