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A Six Sigma Master Black Belt is the top expert in the Six Sigma belt system. This guide explains the role, the skills to look for and when a business should hire one. It also covers how a Master Black Belt differs from a Black Belt and a Green Belt, how to choose between an employee and a consultant, and when Lean Six Sigma Black Belt training may be all your team needs. Read it to see if your business needs one, and what to ask before you hire.