The term “Six Sigma” has two definitions. Firstly, it has a statistical definition. Sigma (the lower-case Greek letter σ) is used to represent the standard deviation (a measure of variation) of a statistical population. The term “Six Sigma” comes from the notion that if one has six standard deviations between the mean of a process and the nearest specification limit, there will be practically no items that fail to meet the specification. Secondly, the term refers to a toolkit of quality tools that are applied within a structured, five-stage improvement methodology known as DMAIC (standing for Define - Measure - Analyze - Improve - Control), designed to drive process improvement towards a Six Sigma level of capability.
|
|
Read more...
|