Deming cycle
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.