Find Root Cause Using 5 Why: A Workplace Incident Investigation Guide

The 5 Why root cause analysis helps discover the root cause of a workplace incident through repeated ‘5 whys’. This approach allows for identifying a range of causes through 5-why questions until identifying the root cause and applying action measures.

A falling object hits a worker. The cause of the incident looks to be unsecured materials at first glance. However, with 5 Why analysis, the root cause is uncovered.

1. Why did the object fall?

Improper secured materials

2. Why were they not secured??

An appropriate stacking method was not followed.

3. Why was stacking improper?

Workers were not trained on the right procedures.

4. Why were they not trained?

No formal training planned

5. Why no training program?

Due to the poor safety training system.

Finally, the real root cause is the lack of a safety training system. Providing employees with proper Incident Investigation Training helps identify root causes effectively and prevent repeated incidents.

Stopping at the first ‘why’ often results in a temporary solution that never closes the actual cause. This can increase the likelihood of repeated incidents, even severe consequences. This emphasizes a ‘5 Why’ approach to pinpoint the actual cause of the incident. Many organizations also strengthen their safety systems through professional HSE consultancy services and safety management support.

The 5 Why method helps organizations identify the real causes behind workplace incidents instead of focusing only on surface-level issues. Combined with proper safety training, it supports better preventive actions, reduces repeated incidents, and helps create a safer workplace environment.

Green World Group supports organizations with professional HSE training and consultancy solutions to strengthen workplace safety and incident prevention.