PDCAサイクルとは? – What is the PDCA cycle? 仕事の基本を英語で学ぶ




What is the PDCA cycle?

The PDCA cycle, also known as the Deming Cycle or Plan-Do-Check-Act cycle, is a systematic four-step iterative model used for continuous improvement and problem-solving in business processes. Developed by quality management pioneer W. Edwards Deming, this cycle is designed to enhance efficiency and effectiveness by promoting a structured approach to problem identification, solution implementation, and performance evaluation.


PDCAサイクル、またはデミングサイクルまたは計画・実施・評価・改善サイクルとも呼ばれるものは、ビジネスプロセスの継続的な改善と問題解決に使用される、体系的な4つのステップの反復モデルです。品質管理の先駆者であるW. Edwards Demingによって開発され、問題の特定、解決策の実施、およびパフォーマンスの評価に対する構造化されたアプローチを促進することで、効率と効果を向上させることを目的としています。


The first step in the PDCA cycle is “Plan.” During this phase, businesses identify the problem or opportunity for improvement, set specific and measurable objectives, and plan the actions needed to achieve these goals. This step lays the foundation for the entire cycle, outlining what needs to be accomplished and how to go about it.




The second step is “Do.” In this phase, the planned actions are executed. This involves implementing the changes or improvements outlined in the planning phase. Clear communication and coordination are crucial during this step to ensure that everyone involved understands their roles and responsibilities in executing the planned activities.




The third step is “Check.” In this phase, businesses evaluate and monitor the results of the implemented actions. It involves comparing the actual outcomes with the planned objectives to determine whether the actions were successful in addressing the identified problem or opportunity. This step provides valuable insights into the effectiveness of the chosen strategies.




The final step is “Act.” Based on the evaluation in the “Check” phase, businesses take corrective actions and implement necessary adjustments to improve the process continuously. This step completes the cycle by incorporating lessons learned and making modifications for better results in future iterations.



What is important for effective PDCA management?

Effective PDCA management requires commitment from all levels of an organization. It is essential to foster a culture of continuous improvement where employees feel empowered to identify and address issues. Communication and collaboration are key, ensuring that feedback is gathered, and lessons learned are shared throughout the organization. Additionally, the commitment to PDCA should be supported by appropriate resources, training, and leadership involvement.



How should we introduce PDCA?

Introducing PDCA requires a thoughtful and systematic approach. Begin by establishing a clear understanding of the organization’s objectives and the specific processes to be improved. Communicate the benefits of PDCA to all stakeholders and involve them in the planning and implementation phases. Training programs on PDCA principles and methodologies can help build a common language and understanding within the organization. Start with a pilot project to demonstrate the effectiveness of PDCA before scaling it across the entire organization.



Any other points?

Continuous improvement is at the core of PDCA, and organizations should encourage a mindset of ongoing learning and adaptability. Embrace feedback as a valuable tool for refinement, and celebrate successes to motivate and engage employees. PDCA is not a one-time process but an iterative cycle, so organizations should view it as a long-term commitment to excellence and strive for incremental enhancements in every iteration.