How to use the 5Whys methodology to perform a root cause analysis

For the problem description defect and each defect, you can use the methodology of 5Whys to perform a root cause analysis of the specific defect. Using this, you can identify the root cause of the problem, and you can develop the corrective actions and preventive actions.

The 5Whys methodology consists of continuously asking why a problem occurred until you find the root cause of the problem. In some cases, you can find the root cause before reaching the fifth (Why) question. In other cases, you might have to ask more than five Why questions to find the root cause. When you identify the root cause, you can find a solution for it to ensure that it does not occur again.

You can add the following types of 5Whys:

• Specific: In this type of Why, you can add the questions that define why the problem occurred.

• Detection: In this type of Why, you can add the questions that define why the problem was not detected earlier.

• Systemic: In this type of Why, you can add the questions that define why the system allowed the problem to occur.

After performing the root cause analysis, you can mark which defect is the root cause.