1.Walk me through the last serious incident you investigated.
Why they ask
Investigations are where a safety program proves itself or falls apart. They want to see whether you find system causes or stop at the injured person's mistake.
How to answer
- Set the scene briefly: the task, the shift, the injury and who you pulled into the investigation
- Name the method you used, such as five whys or a fishbone, and the facts you gathered first
- Describe the root cause you landed on, and why it wasn't just 'employee didn't follow procedure'
- Give the corrective actions, who owned them and how you confirmed they stuck

