At Evocon, our experience of working with manufacturers worldwide continues to demonstrate the importance of two key ideas.

First, real-time visibility into the performance of your production process is a tool that substantially benefits continuous improvement in manufacturing.

Second, real-time production data and visibility by themselves are not enough. To fully leverage the opportunities presented by this new technology, manufacturers must empower more people on the shop floor with the knowledge of how to systematically solve issues that the data bring to light.

This article will assist your effort by introducing one of the essential problem-solving tools available: Root Cause Analysis (RCA). We begin with a definition of RCA and then explore the benefits of root cause analysis in manufacturing. We conclude by discussing RCA’s use as a tool to improve OEE.

What Is Root Cause Analysis?

No Standard Definition

RCA has found a place in a wide range of industries and applications. This leads to many different understandings of what it actually is. Even within manufacturing, we see a variety of definitions. For example, RCA can be a form-driven bureaucratic process that is required when a problem is investigated. In other companies, RCA may be a creative and motivational process. One that began organically after a manager formed a team to investigate problems on the shop floor. The point is that root cause analysis can take many forms and does not have a universal definition.

However, this wide range does not mean that we cannot find some common ground to put forward a definition.

So, for our purposes, root cause analysis is a systematic problem-solving methodology that is geared to understand and eliminate the core cause that lies beneath a problem to prevent future recurrence.

performing root cause analysis
It is important to understand the root cause of a problem.

How Root Cause Analysis Benefits Manufacturers

Staying competitive

In today’s competitive manufacturing landscape, it is as critical as ever to utilize one’s resources as efficiently and effectively as possible.  This naturally applies to activities on the shop floor, such as problem solving. As we will see, RCA is the best and possibly only method to find and eliminate long-term recurring problems. As such, it is the most efficient means available to manufacturers, and this is the primary reason why they use it.

Addressing root causes instead of reactive fire fighting

It is common for companies that do not have a working knowledge of Total Quality Management, Six Sigma, or Continuous Process Improvement to find themselves in an unending reactive state. You may have heard this situation referred to as “firefighting”. It can appear useful in the short term because the fire is put out. Though it is highly ineffective when it comes to preventing the fire from occurring again. Thus, the time and effort spent putting out the flames, or symptoms, is ultimately a waste as the effect is only temporary. The source of the fire still requires elimination.

Putting out fire in a factory

For example, a typical production loss among Evocon clients is “Waiting on parts/Material missing”. The loss itself is self-explanatory and is an easy fire to fight by providing missing material. However, the underlying reason for why the material is missing isn’t as easily identifiable. Further, by putting out the fire without understanding or addressing its root cause, we fail to learn how to improve our processes. Moreover, we are likely to continue to experience the same loss in the future.

If you have worn the fireman’s hat day after day on the shop floor, you may notice two things.

First, the recurring problems that we couldn’t seem to stop stuck out like sore thumbs. Everyone knew what they were. Second, the reactive state that our organization operated in forced us to address symptoms. Further, everyone knew that the daily effort we expended did not improve operational performance over time. This does more than merely lower morale and waste people’s time. It can go so far as to erode the feeling that your work is meaningful.

Fire in the factory put out

Ease of use and quality

Efficiency and effectiveness are gained by manufacturers who target root causes rather than the symptoms of problems. Beyond this, though, there are several other benefits to root cause analysis that can be identified. First among them is that it is logical, straightforward to learn, and easy to use. Further, because RCA relies on facts and data rather than opinions or assumptions to be effective, the quality of solutions improves, as does the participation of most team members.

More benefits are possible by making RCA a daily exercise such that people say “this is the way we problem-solve”. The biggest is that RCA can transform an old reactionary culture into one of proactive problem solvers. This, in turn, reduces variability in processes and counteracts a risk-avoidance mindset.

Minimize cost by solving problems once

Simply stated, solving the problem once is clearly the more cost-effective solution versus continual firefighting. Manufacturers do not have the luxury to waste precious resources this way. RCA helps them prevent this, and this is precisely why manufacturing companies use it.

root cause analysis successful
Once you eliminate the root cause, you remove the problem for good.

Using Root Cause Analysis in Manufacturing to Improve OEE

The previous sections explained that manufacturers use root cause analysis because of the benefits it provides. Specifically, you can use it to solve problems efficiently and effectively.

Overall Equipment Effectiveness (OEE) on the other hand, is the definitive metric used across industries for tracking production line performance. This is because OEE helps us to visualize, quantify, and systematically eliminate sources of production loss.

Bringing the two ideas together then; we have OEE, which allows us to understand the problems causing our production losses. And we have RCA, a systematic problem-solving methodology used by manufacturers to prevent future recurrence of problems in the most efficient way possible. It follows then that this metric and problem-solving methodology fit perfectly together. Indeed, we find this to be true of our experience.

Can you use RCA without OEE? Absolutely, but to maximize the benefits of production monitoring to improve OEE, we recommend using them together. Our experience has demonstrated that the combination saves clients time in project identification and problem elimination. It follows that this increases the value generated by process improvement function overall.


In this article, we covered what RCA is and why root cause analysis in manufacturing is essential. We explained that, despite having a wide variety of definitions, it is ultimately about finding and solving the one cause that, when eliminated, prevents the problem from returning. We also explored why combining OEE and RCA is the best practice for manufacturers looking to improve OEE most efficiently and effectively possible.

If you are interested in learning more about the root cause analysis process and how it is performed, you can check our article How to Perform Root Cause Analysis (RCA) in 6 steps.

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