Why Should Interviewers Ask Two Questions In The Interview Process?

Please Explain why should interviewers include these two questions in the interview process.

Do some research, and explain Why it is important to ask candidates these two questions?  

Question 1:  How would you handle a disagreement among staff or how you implement a new policy if the workers are hesitant to change? 

Question 2:  Tell me about a challenge or conflict you’ve faced at work, and how dealt with it.

Please write 2 paragraphs and explain each question.

And provide some references.

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