"Orange belts" are also mentioned to be used for special cases.General Electric and Motorola developed certification programs as part of their Six Sigma implementation, verifying individuals' command of the Six Sigma methods at the relevant skill level (Green Belt, Black Belt etc.).
Organizations need to determine an appropriate sigma level for each of their most important processes and strive to achieve these.
As a result of this goal, it is incumbent on management of the organization to prioritize areas of improvement.
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, and increase profits.
The term Six Sigma (capitalized because it was written that way when registered as a Motorola trademark on December 28, 1993) originated from terminology associated with statistical modeling of manufacturing processes.
Six Sigma projects follow two project methodologies inspired by Deming's Plan–Do–Study–Act Cycle.
These methodologies, composed of five phases each, bear the acronyms DMAIC and DMADV.
Six Sigma strategies seek 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.
"Six Sigma" was registered June 11, 1991 as The Lean Six Sigma methodology views lean manufacturing, which addresses process flow and waste issues, and Six Sigma, with its focus on variation and design, as complementary disciplines aimed at promoting "business and operational excellence".
Other standards have been created mostly by universities or companies that have first-party certification programs for Six Sigma.