Which statement best describes the Five-Why Method?

• A. It is only applicable to manufacturing problems
• B. It requires multiple teams from different departments
• C. It uses statistics to analyze data rigorously
• D. It repeatedly asks 'Why?' to peel away symptoms and reveal root causes

Answer: (D)

The Five-Why Method is a problem-solving approach that digs into the cause of a problem by repeatedly asking why. It aims to move beyond obvious symptoms to uncover the underlying reason the issue occurred.

This technique isn’t limited to manufacturing. It’s a flexible tool used across many fields to identify root causes, whether you’re fixing a process, service, or malfunction. It doesn’t rely on statistics or formal data analysis, and it doesn’t require multiple teams—one person or a small team can run it by asking successive questions and writing down the answers.

In practice, you start with a clear problem statement, ask why the problem happened, write the answer, and then ask why again for that answer. You repeat this process until you reach a root cause that, when addressed, would prevent the problem from recurring. The idea is to peel away layers of symptoms until you reach a cause that will truly fix the issue, even if it takes more or fewer than five questions.

For example, if a machine stops working, you might ask why it stopped, why the battery is dead, why the alternator isn’t charging, and so on, until you identify a root cause such as a failed maintenance schedule. This illustration shows why repeatedly asking why helps reveal the true problem rather than just the surface symptoms.