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20 people walking a process is definitely too many. Ideally, 6-11 people walk the process. If the numbers approach greater than 12, I would work with the internal resources to start to be a bit more selective.
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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.