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Yes, PDSA is a variant of PDCA. Some prefer to use the “S” instead of the “C”. The “S” would stand for Study, to imply that it’s not just checking on something, but performing the root cause analysis needed to do the “A” (Act). I have also seen others call “A” Adjust instead of Act.
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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.