PDCA (Plan Do Check Act)

Continually Improving, in a Methodical Way

Also known as PDSA, the "Deming Wheel," and "Shewhart Cycle"

 Imagine that your customer satisfaction score on a business ratings website has dipped. When you look at recent comments, you see that your customers are complaining about late delivery, and that products are being damaged in transit.

So, you decide to run a small pilot project for a month, using a new supplier to deliver your products to a sample set of customers. And you're pleased to see that the feedback is positive. As a result, you decide to use the new supplier for all your orders in the future.

What you've just done is a single loop called the PDCA Cycle. This is an established tool for achieving continuous improvements to your business.

The PDCA approach was pioneered by Dr William Deming, and we've worked closely with The Deming Institute to produce this article. In it, we outline the key principles of PDCA, and explain when and how to put them into practice.

What Is PDCA?

In the 1950s, management consultant Dr William Edwards Deming developed a method of identifying why some products or processes don't work as hoped. His approach has since become a popular strategy tool, used by many different types of organizations. It allows them to formulate theories about what needs to change, and then test them in a "continuous feedback loop."

The Four Phases of the PDCA Cycle

With the PDCA cycle you can solve problems and implement solutions in a rigorous, methodical way. Let's look at each of the four stages in turn:

1. Plan.

First, identify and understand your problem or opportunity. Perhaps the standard of a finished product isn't high enough, or an aspect of your marketing process should be getting better results.

Explore the information available in full. Generate and screen ideas, and develop a robust implementation plan.

Be sure to state your success criteria and make them as measurable as possible. You'll return to them later in the Check stage.

2. Do.

Once you've identified a potential solution, test it safely with a small-scale pilot project. This will show whether your proposed changes achieve the desired outcome – with minimal disruption to the rest of your operation if they don't. For example, you could organize a trial within a department, in a limited geographical area, or with a particular demographic.

As you run the pilot project, gather data to show whether the change has worked or not. You'll use this in the next stage.

3. Check.

Next, analyze your pilot project's results against the expectations that you defined in Step 1, to assess whether your idea was a success.

If it wasn't, return to Step 1. If it was, advance to Step 4.

You may decide to try out more changes, and repeat the Do and Check phases. But if your original plan definitely isn't working, you'll need to return to Step 1.

4. Act.

This is where you implement your solution. But remember that PDCA/PDSA is a loop, not a process with a beginning and end. Your improved process or product becomes the new baseline, but you continue to look for ways to make it even better.

The four stages of the cycle are illustrated in Figure 1, below:

When to Use PDCA

The PDCA/PDSA framework works well in all types of organizations. It can be used to improve any process or product, by breaking them down into smaller steps or development stages, and exploring ways to improve each one.

How to Use PDCA in Your Life

While PDCA/PDSA is an effective business tool, you can also use it to improve your own performance:

First, Plan: Identify what's holding you back personally, and how you want to progress. Look at the root causes of any issues, and set goals to overcome these obstacles.

Next, Do: When you've decided on your course of action, safely test different ways of getting the results that you want.

Then, Check: Review your progress regularly, adjust your behavior accordingly, and consider the consequences of your actions.

Finally, Act: Implement what's working, continually refine what isn't, and carry on the cycle of continuous improvement.