What are the Six Sigma method used to measure processes?
a. Six Sigma follows two methodologies, composed of five phases each: DMAIC and DMADV.
b. Formal Six Sigma programs adopt a ranking terminology to define a hierachy that cuts across all business functions.
c. The term six sigma process comes from the notion that if one has six standard deviations between the process mean the nearest specification limit, pratically no items will fail to meet specifications.