What is Root Cause Analysis? Definition, Process & Examples

Quick Overview

1. Understand RCA: Learn how it identifies the underlying causes of problems.

2. Follow the Process: Explore the steps from defining a problem to checking corrective actions.

3. Choose Suitable Tools: Discover how fishbone diagrams, the 5 Whys and other techniques support investigations.

4. Avoid Common Mistakes: Strengthen your analysis with evidence and practical checks.

5. Explore Examples: See how RCA applies to IT, manufacturing, healthcare and other sectors.

In 1986, the world was left shaken by the Chernobyl nuclear disaster. That shock was not just because of the disastrous consequences of event, but because of what it revealed underneath: layers of human error, design flaws and miscommunication. This tragic event is a haunting example of why Root Cause Analysis (RCA) matters. More than fixing what’s broken, RCA is about digging deep to find the real reason things go wrong.

It reveals hidden patterns we often overlook and bridges the gap between tough problems creative solutions. This blog explores root cause analysis in detail, highlighting how it works and why it’s so powerful. So read on and embrace the smart way of preventing and treating problems!

What is Root Cause Analysis (RCA)?

Root Cause Analysis (RCA) is a structured method that is embraced by a range of organisations for zeroing in on the core cause of a problem or incident. The power behind RCA is that instead of just fixing the visible symptoms, it digs deeper to uncover what truly caused the issue. The aim is to prevent it from happening again by solving the root cause once and for all.

RCA requires numerous steps like collecting data, reviewing events, finding key contributing factors and finally creating corrective actions. Common tools that help with RCA include the 5 Whys and the fishbone diagram. These are used across various fields, such as healthcare, manufacturing and IT to improve processes.

To determine the main reasons why a problem popped up, root cause analysis is a proven way. To accomplish this, you have to follow certain steps. Here are the key steps involved:

1) Define the Problem

Defining the problem is the primary step in root cause analysis. A well-defined problem statement sets out the foundation for a focused RCA. It involves the following activities:

a) Start the process by clearly defining the problem or incident that requires analysis.

b) Describe the issue in specific terms.

c) Include information on its impact, frequency, and any relevant background information.

2) Collect Data About the Problem

Collect all available Data and information related to the problem. The goal is to understand the problem and its context comprehensively. This may include the following:

a) Incident reports

b) Documentation

c) Data logs

d) Witness statements

e) Any other relevant sources

Trainer Insight

Separate what you know from what you suspect. For example, “the machine stopped at 10:15” is an observation. “Poor maintenance caused the stoppage” is a hypothesis that needs supporting evidence.

3) Determine Potential Causal Factors

This step includes conducting the following activities:

a) Brainstorming and narrowing down a list of potential causes that may catalyse the problem.

b) Encouraging diverse-minded individuals with a range of perspectives to participate in this process.

c) Incorporating fishbone diagrams, the 5 Whys or data analysis to explore potential causes.

4) Determine the Root Cause of the Problem

Following the identification of possible causes, assess each one to determine which is most likely responsible for the problem. Consider:

a) Reviewing the evidence supporting each potential cause.

b) Assessing its likelihood and impact on the issue.

c) Identifying the underlying cause that best explains the problem.

Pro Tip

If your conclusion is simply “human error”, investigate further. Were instructions clear? Was equipment suitable? Did workload or missing checks contribute? These questions can reveal conditions that corrective actions should address.

5) Prioritise the Causes

If multiple causes are identified, rank them based on their importance so you can address the most critical issues first. This involves:

a) Evaluating which causes have the greatest impact or likelihood.

b) Focusing on the causes that can be definitely controlled and resolved.

c) Using tools such as a cause-and-effect matrix or Pareto analysis to prioritise them.

6) Solution, Recommendation and Implementation

This is the most crucial step in conducting the root cause analysis. This step involves the following:

a) Putting the corrective actions into practice.

b) Assigning responsibilities.

c) Establishing timelines.

d) Allocating necessary resources to implement the solutions effectively.

Furthermore, Effective Communication and collaboration can be of paramount importance during this stage. This ensures everyone involved understands their roles and responsibilities.

Learn modern ITIL concepts for digital products, services and value creation with the ITIL® 5 Foundation Certification – Join now!

What are the Various Tools Used to Conduct RCA?

Root Cause Analysis (RCA) employs various methods and tools to systematically investigate and uncover the underlying causes of a problem. Let's explore some commonly used root cause analysis tools:

1) Fishbone Diagram (Ishikawa Diagram)

The Fishbone diagram, also known as the Ishikawa diagram, is a visual root cause analysis tool. It’s used to identify the possible causes of a problem. It looks like the skeleton of a fish, with the head representing the main issue and the branching bones representing potential causes. 

This technique helps teams examine different factors such as people, processes, materials, equipment and the environment. Exploring all the possible contributing factors encourages a more comprehensive approach to problem-solving.

2) 5 Whys Analysis

The 5 Whys analysis is a simple yet effective technique used to uncover the root cause of a problem. It involves asking the question "Why?" repeatedly (typically five times) to dig deeper into the issue. Each answer leads to the next question. This helps teams move beyond surface-level symptoms and identify the underlying cause. This method promotes logical thinking and helps organisations address problems at their source.

3) Pareto Analysis

Pareto analysis is also known as the 80/20 rule. It helps identify the small number of causes that are responsible for the majority of a problem's impact. It states that roughly 80% of outcomes emerge from 20% of causes.  By highlighting the most significant issues, it allows teams to focus resources where they will make the biggest difference. 

When using Pareto analysis in Root Cause Analysis (RCA), the process starts by collecting data on the potential causes of a problem, such as defects or errors in a process. The steps include:

a) Identify Causes: List all possible causes that may be contributing to the issue.

b) Gather Data: Measure how often each cause occurs or its level of impact.

c) Build a Pareto Chart: Arrange the causes on a chart from the most to the least significant.

d) Add a Cumulative Line: Include a cumulative line to show the total impact of the causes together.

e) Focus on Key Causes: Pinpoint the vital few causes that have the most considerable impact and prioritise them.

4) Fault Tree Analysis

Fault Tree Analysis (FTA) is a systematic method used to investigate the root causes of failures within a system. It visually maps how multiple factors and events can combine to result in a major issue or system failure. 

By identifying the weak points and possible failure paths, FTA helps teams better understand risks and take preventive measures. This makes it a valuable tool for improving system performance and safety.

5) Failure Mode and Effects Analysis (FMEA)

FMEA is a proactive risk assessment technique. It helps narrow down the potential failures before they occur. It evaluates each possible failure based on its severity, likelihood of occurrence and ease of detection. This helps teams prioritise the most critical risks and take corrective action early. As a result, FMEA can reduce costs, improve quality, boost safety and increase overall system reliability.

6) Change Analysis

Change analysis focuses on identifying recent changes that may have contributed to a problem. It involves reviewing process updates, system modifications, environmental factors or external influences to determine what changed before the issue occurred. By linking problems to specific events or alterations, organisations can more effectively identify root causes.

7) DMAIC Template

The DMAIC template is a highly structured approach that provides a framework for processing and tackling the problems arising in multiple processes. Every letter of the acronym refers to a different step in the problem-solving procedure. They are as follows:

a) Define (D): In this stage, team members identify and articulate a specific problem or goal. The purpose here is to set a clear understanding of the issue so that the team may focus on it.

b) Measure (M): This phase focuses on tracking or measuring the problem using specific metrics. It’s normal to use tools like Pareto charts on a project to pinpoint important areas that need attention.

c) Analyse (A): In this step, break down the possible causes of problems that you are dealing with using root cause analysis. This can help prevent the issue from happening again in the future. 

d) Improve (I): This stage aims at examining the performance improvements that could eliminate some of the root causes of issues. Across this stage, all improvements should lead to positive changes. Otherwise, they should be replaced with more suitable solutions.

e) Control (C): This final component is important for landing and maintaining the outcomes achieved through the former stages and ensuring that these outcomes are long-standing. Moreover, it prevents waste of time and unnecessary efforts.

Build the expertise to elevate IT services with confidence in our Certified IT Service Manager (CITSM) Certification Training - Sign up now!

8) Scatter Plot Diagram

A Scatter plot diagram, also known as a scatter diagram, is a graphical tool. By plotting data points along the horizontal and vertical axes, it helps identify correlations or the absence of a relationship between factors. Scatter plots are particularly handy when it comes to detecting outliers and predicting potential outcomes. They provide a clear visual representation of how one variable may influence another.

Here’s how you can use it:

a) Plot the Data: Start by mapping the data points on a graph, with each axis representing one of the variables.

b) Look for Trends: Analyse the chart for any noticeable patterns or trends that suggest a relationship between the two variables.

c) Identify Correlations: Check if there is a positive, negative, or no correlation between the variables.

d) Spot Outliers: Highlight any outliers in the data, as they could point to unusual factors influencing the results.

e) Explore Cause-and-effect: Use the diagram to hypothesise how one variable might affect the other.

f) Compare Data Sets: You can also compare different data sets to see how patterns or correlations vary.

Tips for Performing Effective Root Cause Analysis

To get the most out of RCA, it’s important to approach it with the right mindset. These tips can make sure that your analysis is accurate and thorough:

1) Build a Cross-Functional RCA Team

Root cause analysis is often most effective when it is approached as a collaborative endeavour. Consider these points:

a) Don’t go it alone. Effective root cause analysis requires collaboration.

b) Include team members from more than one department or with varied perspectives.

c) New or neutral participants can often spot issues that others may overlook.

d) Team brainstorming sessions can uncover a broader range of possible causes and solutions.

2) Prepare Before the Next Problem Hits

By preparing in advance, organisations can improve efficiency and ensure that valuable lessons are not lost. Consider these points:

a) Create a structured RCA process that’s easy to follow and repeat.

b) Document past issues, outcomes, and solutions to build a learning database.

c) Train employees on RCA tools and techniques so they can act quickly on issues.

d) Having templates, workflows, and tools ready will save time and increase consistency.

3) Apply RCA to Successes, Not Just Failures

Studying what worked well helps you understand the reasons behind your success, so you can repeat it deliberately rather than by chance. Keep these points in mind:

a) RCA isn’t just for fixing problems; it can also help you understand what went right.

b) Analysing successful projects or outcomes reveals the key factors behind that success.

c) Use this knowledge to replicate positive results across teams or future projects.

d) Learning from wins helps you strengthen best practices.

Common Mistakes That Weaken RCA

1. Starting with a preferred answer: Investigate competing explanations.

2. Stopping at the failed component: Examine why it failed and which safeguards did not work.

3. Treating correlation as proof: Check whether another factor explains the relationship.

4. Choosing actions too early: Validate causes before committing to permanent solutions.

5. Closing after implementation: Check whether the action worked.

Build in-demand expertise to shape successful product strategies in our ITIL® 5 Product Certification Training - Sign up now!

When Should You Perform a Root Cause Analysis?

You should perform a root cause analysis in several key situations:

1) After significant incidents when safety issues, injuries, or near-misses occur.

2) For recurring problems when the same issue keeps happening despite attempted fixes.

3) During quality deviations when products or services fail to meet standards.

4) For customer complaints, especially patterns of similar feedback.

5) Following system failures when processes, equipment or technology break down.

6) During performance gaps when results consistently fall short of targets.

7) Before implementing major changes to understand current issues before improvement.

8) For compliance violations when regulatory requirements aren't met.

9) For costly events when financial impact requires deeper understanding.

RCA is most valuable when the stakes are high or the issue is likely to recur without deeper intervention. The investment in thorough analysis pays off by preventing future occurrences and their associated costs.

Benefits of Root Cause Analysis

Root cause analysis offers several benefits to organisations in their problem-solving and improvement efforts. Here are the key Benefits of Conducting RCA:

1) It prevents recurrence of the problem by digging into the underlying cause.

2) It reduces costs and minimises waste through process optimisation.

3) Improves product and service quality by resolving root causes.

4) It drives continuous improvement and improves operational efficiency.

5) It facilitates decision-making based around comprehensive understanding, rather than assumptions.

6) It bolsters risk management by detecting and mitigating potential issues.

7) It inspires a proactive approach to problem-solving and prevention.

8) It increases customer satisfaction thanks to better problem resolution.

9) It empowers the Employees by involving them in the problem-solving processes.

Examples of Root Cause Analysis

The following examples will showcase how root cause analysis works:

1) Example 1: A Software Company’s Server Outage

a) Problem: The server crashes during a critical client demo.

b) Root Cause: A hardware failure on the server’s disk drive.

c) Solution: Implement a more robust monitoring system to detect hardware issues earlier and maintain redundant systems.

2) Example 2: A Manufacturing Plant’s Production Line Delay

a) Problem: The production line is delayed, thus affecting shipment deadlines.

b) Root Cause: A specific machine is revealed to have faulty parts that caused repeated breakdowns.

c) Solution: Regularly check machine parts, implement predictive maintenance and train the Operators to detect early signs of failure.

3) Example 3: A Medical Device Malfunction

a) Problem: A medical device malfunctions during use in a hospital setting.

b) Root Cause: Design flaw in the device’s battery compartment that caused it to overheat.

c) Solution: Redesign the battery compartment, enhance quality assurance tests, and conduct post-launch reviews.

4) Example 4: A Retail Business Inventory Discrepancy

a) Problem: The company finds discrepancies in inventory records.

b) Root Cause: Poor communication between the stockroom staff and sales team, which led to inaccurate inventory updates.

c) Solution: Introduce a better inventory management system and conduct regular training on accurate stock tracking.

5) Example 5: A Restaurant’s Customer Satisfaction Drop

a) Problem: Customer satisfaction levels drop significantly in a restaurant.

b) Root Cause: Inconsistent food quality due to lack of standardised cooking procedures.

c) Solution: Standardise cooking procedures and provide ongoing staff training to ensure quality consistency.

Quick Practice: Have You Found the Root Cause?

A team misses a delivery deadline. The initial explanation is “an employee forgot to submit the order”.

The investigation should next examine how orders are recorded, whether responsibilities are clear and which reminders or exception checks exist. The employee’s action describes what happened. Further evidence is needed to understand the conditions that allowed it.

The transition from service management to business excellence is just a click away. Sign up for our ITIL® Certification Training now!