Selecting the right root cause analysis tools to solve a problem is paramount to not only ensure the analysis is effective and efficient, but also that the real root cause is in fact identified. Identifying the root cause doesn’t require complex tools. Effective root cause analysis can be done using five simple tools.
The brainstorming process brings together a group of people to discuss the issue in a question in a facilitated environment. The basic premise is that a group of people working collectively to find a solution is more productive and innovative than if each person tried to come up with a solution individually.
Basic steps of the brainstorming process include: scheduling a meeting, informing the participants of the topic to be discussed, assigning a specific person in the meeting who will write down people’s thoughts, with all participants having equal opportunity to participate. The resulting discussion should identify the root cause of the problem and try to resolve it.
2. The 5 whys
Suggested by some as being the simplest root cause analysis tool, “the 5 whys” technique uses a question-asking method to explore the cause-and-effect relationship underlying the problem. Essentially, the investigator keeps asking “why” until a meaningful conclusion is reached. Generally, a minimum of five questions should be asked, although additional questions are sometimes required if the real cause is yet to be identified, rather than simply settling for a partial conclusion.
Flowcharts organize information about a process in a graphical manner, making it clear what is impacted. Although there are numerous flowcharting tools available, it is recommended that individuals keep their flowcharts simple, using a rectangle for a process step, an arrow for direction, and a diamond for a decision point.
4. Fishbone diagrams
Another commonly used method of root cause analysis—fishbone diagrams—are most useful when the “5 whys” is too basic. Fishbone diagrams are also known as cause-and-effect diagrams.
In a fishbone diagram, the various causes are grouped into categories, with arrows in the image indicating how the causes flow toward the nonconformity. Categories used in the fishbone diagram are not pre-defined, but common categories include equipment, processes or methods, measurements, materials, environment, and people.
This type of root cause analysis is a causal process and seeks to understand the possible causes by asking questions such as “what actually happened,” “when,” “where,” “why,” “how,” and “so what” until a possible cause is identified and the consequences and significance is investigated for each category.
5. Affinity diagrams
The final root cause analysis tool is affinity diagrams. Often the output from a brainstorming session, an affinity diagram can be used to generate, organize, and consolidate information related to the issue in question.
After ideas have been generated, they can be grouped according to their similarity to identify the major causes. An affinity diagram should be used to stimulate discussion about a problem or issue, opening up possibilities for improvement or solution.
Combining root cause analysis tools
Combining tools is practical and often necessary. For example, although brainstorming can lead to some great hypotheses, the data can be difficult to confirm without organizing it in a fishbone diagram and then seeking out objective evidence to substantiate the idea.
Although most root cause analysis tools have the desired results if they are correctly applied, it’s important to make sure people know how to use them. To find out how to use any of these root cause analysis tools, Exemplar Global College offers several short informative courses. Please visit technical knowledge page for more details.