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The Deming Cycle or The Plan-Do-Check-Act (PDCA) model is a proven framework for implementing continuous quality improvement. It originated in the 1920s with Walter A. Shewhart. These four steps provide the framework for continuous improvement. The PDCA cycle basically starts with a plan and ends with an action in accordance with the information learned during the process. In later years Dr. Deming actually changed the Check portion to the term Study to highlight the creation and validation of new knowledge during that portion of the cycle. There is a Slideshare presentation using this slideck.