What is the most difficult work problem you ever had to deal with?

How to answer? First, make sure it's a real problem - not lost keys or a routine issue. Explain the situation. Talk briefly about the step by step process you went through to resolve the issue. Finish your answer with the outcome of the situation - whether successful or not.

What is the interviewer looking for?
- A logical process
- Your ability to remain calm in the face of stress
- Creativity and an innovative approach to problems.
- Communication skills and keeping the necessary parties in the loop

Use these elements in your answer and you're on your way to hitting an interview home run!