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http://djadja.web.id/2012/10/23/profesor-muhammad-yunus-merubah-paradigma-naco-not-action-concept-only-menjadi-pdca-plan-do-check-and-action/
Profesor Muhammad Yunus: Merubah Paradigma NACO (Not Action Concept Only) Menjadi PDCA (Plan, Do, Check and Action)