It seeks to improve the quality of the output of a process by identifying and removing the causes of defects and minimizing variability in manufacturing and business processes. It uses a set of quality management methods, mainly empirical, statistical methods, and creates a special infrastructure of people within the organization who are experts in these methods.
Each Six Sigma project carried out within an organization follows a defined sequence of steps and has specific value targets, for example:
- Reduce process cycle time
- Reduce pollution
- Reduce costs
- Increase customer satisfaction
- Increase profits.
The term Six Sigma originated from terminology associated with statistical modeling of manufacturing processes. The maturity of a manufacturing process can be described by a sigma rating indicating its yield or the percentage of defect-free products it creates, to within how many standard deviations of normal distribution the fraction of defect-free outcomes corresponds.
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