Should the PDCA Cycle Now Be Viewed as the PDCI Cycle?

Should the PDCA Cycle Now Be Viewed as the PDCI Cycle?

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The Plan–Do–Check–Act (PDCA) Cycle has been the cornerstone of Quality Management and various Management Systems for several decades. Today, almost all management system standards—including ISO 9001, ISO 14001, ISO 45001, ISO 50001, and ISO 27001—are built around this fundamental concept. 

A thought-provoking question arose during an informal discussion recently: Should the final stage of the PDCA Cycle, "Act," be expressed more explicitly as "Improvement"? Is it time to view the cycle as PDCI (Plan–Do–Check–Improvement)?

Through this article, I attempt to present an analysis of this idea.

Historical Significance of the PDCA Cycle 

The PDCA Cycle was developed to provide a systematic approach to quality improvement. Its four stages are:

• Plan – Establish objectives and develop the plan.

• Do – Implement the planned activities.

• Check – Monitor, measure, and evaluate the results.

• Act – Take appropriate actions to implement improvements.

This globally accepted cycle has made a significant contribution to developing a culture of continual improvement in organizations across the world.

Is the Word "Act" Sufficiently Clear?

Practical experience shows that many participants in training programmes interpret the word "Act" simply as "taking action."

In reality, it encompasses much more:

• Corrective action

• Necessary changes

• Standardization of successful practices

• Beginning the next cycle of improvement

In other words, the real objective of the Act phase is Improvement.

The Perspective of ISO Management System Standards

In today's ISO Management System Standards, Improvement has been given an independent and highly significant place. Almost every management system ultimately aims at:

• Continual Improvement

• Improved Performance

• Effective Management of Risks

• Fulfilment of the needs and expectations of customers and other Interested Parties

From this perspective, the term Improvement has become more prominent than ever before.

A Proposal: The PDCI Cycle

If the final stage is expressed directly as Improvement, the cycle becomes:

Plan → Do → Check → Improvement

This immediately conveys that the ultimate objective of every management system is not merely to take action but to achieve measurable improvement. 

Should PDCA Be Replaced? 

In my opinion, the answer is no. There are several reasons:

• The PDCA Cycle is a globally recognized and well-established model.

• Improvement is already inherent within the Act stage.

• Changing internationally accepted standards, literature, and training material would neither be practical nor necessary. 

Instead, training, writing, and awareness programmes may explain the final stage as: 

Act = Improve + Standardize + Learn

or

PDCA = Plan – Do – Check – Act for Improvement 

This approach preserves the traditional model while making its true intent much clearer. 

Conclusion 

The PDCA Cycle remains a globally accepted model for Quality Management. There is no need to replace it. However, its interpretation can be explained more clearly in today's context. 

If the term PDCI helps learners and practitioners better understand that the ultimate objective of every management system is Continual Improvement, it may be presented as a conceptual model for discussion and learning. 

Although this is only a conceptual proposal, it may encourage meaningful discussion among quality professionals and contribute to the continued evolution of management system thinking. 

Disclaimer 

This article presents the personal views of the author. It is not intended to replace the established PDCA concept, but rather to stimulate discussion on whether the underlying purpose of the "Act" stage—Continual Improvement—can be communicated more explicitly. 

Regards, 

Keshav Ram Singhal