What are the key differences between a Green Belt, Black Belt and Master Black Belt?

Here is a brief overview of each course:

• Lean Six Sigma Green Belt ($399, 32 hours): In-depth Lean Six Sigma course which enables learners to complete successful projects by walking you step-by-step through the DMAIC methodology.
• Lean Six Sigma Black Belt (Prerequisite of Green Belt, $499, 48 hours): Advanced Lean Six Sigma course which enables learners to manage process improvement programs and help them become a better leaders.