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This is a given. Variation can happen naturally in many processes. I would define more specific conditions, like “80% of the time what happens? 80% of the time how long does it take?” or put together a range for the Lead Times or Process Times.
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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.