History and Origins of Six Sigma

What is Six Sigma?
Where did it originate / What is the history of Six Sigma?
What is its purpose / focus?
Describe the core philosophy and key concepts of six sigma
Describe the DMAIC Methodology
Describe the "Belts" (green-black) of six sigma and their duties and qualifications.

1500 words w/ references (at least 5)

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