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Both are highly applicable. Lean is great if for organizations just starting out. The concepts are simple and can he very impactful. Six Sigma concepts especially the DMAIC methodology is very helpful, and Six Sigma is more statistical in nature. There is a lot of application where proving statistical significance is important.
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Tracy O'Rourke

Tracy is a Master Black Belt at, the co-author of The Problem-Solver’s Toolkit and co-host of the Just-in-Time Cafe. She is also a Lean Six Sigma Green Belt Instructor at UC San Diego and teaches in San Diego State University’s Lean Enterprise Program. For almost 20 years, she has helped leading organizations like Washington State, Charles Schwab and GE build problem-solving muscles.