Plan-Do-Check-Act (PDCA)

This circular arrows diagram sample depicts the Plan–Do–Check–Act cycle.
"PDCA (plan–do–check–act or plan–do–check–adjust) is an iterative four-step management method used in business for the control and continuous improvement of processes and products. It is also known as the Deming circle/ cycle/ wheel, Shewhart cycle, control circle/ cycle, or plan–do–study–act (PDSA). Another version of this PDCA cycle is OPDCA. The added "O" stands for observation or as some versions say "Grasp the current condition." This emphasis on observation and current condition has currency with Lean manufacturing/ Toyota Production System literature." [PDCA. Wikipedia]
The diagram example "PDCA cycle" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Circular Arrows Diagrams solution from the area "What is a Diagram" of ConceptDraw Solution Park.

This business infographic sample shows the plan–do–check–act cycle. It was designed on the base of the Wikimedia Commons file: PDCA-Cycle.png.
[commons.wikimedia.org/ wiki/ File:PDCA-Cycle.png]
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. [creativecommons.org/ licenses/ by-sa/ 3.0/ deed.en]
"PDCA (plan–do–check–act or plan–do–check–adjust) is an iterative four-step management method used in business for the control and continual improvement of processes and products. It is also known as the Deming circle/ cycle/ wheel, Shewhart cycle, control circle/ cycle, or plan–do–study–act (PDSA)." [PDCA. Wikipedia]
The business infographic example "PDCA cycle" was designed using ConceptDraw PRO diagramming and vector drawing software extended with the Business and Finance solution from Illustration area of ConceptDraw Solution Park.

This Deming cycle sample shows plan-do-control-act diagram variance.
It was designed on the base of Wikimedia Commons file: Demingcycle.svg. [commons.wikimedia.org/ wiki/ File:Demingcycle.svg]
"PDCA was made popular by Dr W. Edwards Deming, who is considered by many to be the father of modern quality control; however, he always referred to it as the "Shewhart cycle". Later in Deming's career, he modified PDCA to "Plan, Do, Study, Act" (PDSA) because he felt that "check" emphasized inspection over analysis. PDSA cycle was used to create the model of know-how transfer process." [PDCA. Wikipedia]
The plan-do-control-act diagram example "Deming cycle" was designed using ConceptDraw PRO software extended with Plan-Do-Check-Act (PDCA) solution from Management area of ConceptDraw Solution Park.