Answer:
To understand reasons why an incident has occurred
Explanation:
When we talk about the incident investigation, we usually think about the investigation of incidents at the workplace. The term incident refers to an occurrence arising in the course of work that resulted in (or could have resulted in) injuries, illnesses, or fatalities.
The purpose of the incident investigation is to understand the reasons why an incident has occurred - to identify its causes and find ways to prevent the incident from happening again.