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.

Tracy O'Rourke

Tracy is a Managing Partner & Executive Advisor at For almost 20 years, she's helped leading organizations like Washington State, Cisco and GE build problem-solving muscles with Lean Six Sigma to achieve their goals.