Curriculum Lean Process and Six Sigma What is "Sigma"? The word is a statistical term that measures how far a given process deviates from perfection. Sigma is a way to measure quality and performance. The central idea behind Six Sigma is that if you can measure how many "defects" you have in a process, you can systematically figure out how to eliminate them and get as close to "zero defects" as possible. This E-learning will give you an overview of the Six Sigma methodology, and some of the tools required to deploy Six Sigma in their own organizations.