In root cause analysis, which statement differentiates root cause from contributory cause?

In root cause analysis, which statement differentiates root cause from contributory cause?

• A. Contributory causes are the fundamental reason for the problem; root cause is a secondary factor.
• B. The root cause is the fundamental reason for the problem; contributory causes are secondary factors that contributed to the issue.
• C. Root cause is the symptom that prompts investigation, while contributory causes are the actual root causes.
• D. Root cause and contributory causes are interchangeable terms.

Answer: (B)

In root cause analysis, the focus is on separating the fundamental driver of the problem from the contributing factors. The best statement captures that the root cause is the fundamental reason for the issue, while contributory causes are secondary factors that helped produce the problem. When you fix the root cause, you address the underlying reason the failure occurred, which tends to prevent recurrence; addressing contributory causes alone might reduce some effects but won’t stop the problem if the core driver remains. For example, if a production defect stems from a design flaw in the process (root cause), contributing factors could be worn tooling or gaps in operator training; correcting the design flaw stops recurrence, while fixing those factors without addressing the root cause may not fully resolve the issue. The other statements mix up roles or imply the terms are interchangeable, which would lead to ineffective corrective actions.

In root cause analysis, the focus is on separating the fundamental driver of the problem from the contributing factors. The best statement captures that the root cause is the fundamental reason for the issue, while contributory causes are secondary factors that helped produce the problem. When you fix the root cause, you address the underlying reason the failure occurred, which tends to prevent recurrence; addressing contributory causes alone might reduce some effects but won’t stop the problem if the core driver remains. For example, if a production defect stems from a design flaw in the process (root cause), contributing factors could be worn tooling or gaps in operator training; correcting the design flaw stops recurrence, while fixing those factors without addressing the root cause may not fully resolve the issue. The other statements mix up roles or imply the terms are interchangeable, which would lead to ineffective corrective actions.