Final answer:
The "3 W" questions used to guide an accident investigation are: What is/was the cause of the problem? What is/was the effect of the problem? What makes this problem a problem? By answering these questions, investigators can determine the root cause of the accident, understand the consequences, and identify why the problem occurred in the first place.
Step-by-step explanation:
The "3 W" questions used to guide an accident investigation are:
What is/was the cause of the problem?
What is/was the effect of the problem?
What makes this problem a problem?
By answering these questions, investigators can determine the root cause of the accident, understand the consequences, and identify why the problem occurred in the first place. This information is crucial in developing effective solutions to prevent similar accidents in the future.