- Quality Progress
- November 2010
- Volume 43 Issue 11
- pp. 22-28
- Moen, Ronald D., Norman, Clifford L.
- Associates in Process Improvement, Georgetown, TX
W. Edwards Deming developed the Deming cycle, or Deming wheel, in 1950. He evolved it into what he started calling in the 1980s the plan-do-study-act (PDSA) cycle or the Shewhart cycle for learning and improvement. He strongly objected to conflating the PDSA cycle with the Japanese plan-do-change-act or PDCA cycle, which he saw as a corruption. While the PDCA cycle has been largely unchanging since the 1960s, a number of significant refinements to the Deming cycle have been introduced, including the addition of a model for improvement to guide all four steps of the cycle.