Dr Deming's pdsa theory was first put forward by Dr Deming, an American quality management expert. This is a scientific procedure that total quality management should follow. The whole process of total quality management activities is the process of formulating and organizing quality plans, which runs endlessly according to PDCA cycle.

PDCA is the first letter of English words Plan, Do, Check and Act. You can learn more about quality management in the nine knowledge systems of project management.