Definition :
PDCA (plan-do-check-act, sometimes seen as plan-do-check-adjust) is a repetitive four-stage model for continuous improvement in business process management. It is an Iterative four-advance Management technique utilized in business control and continual improvement of processes and products. The PDCA cycle as a model for characterizing a large portion of their work forms, from the meeting room to the classroom.
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Further Reading:
Scrum by Jeff Sutherland