Have you changed jobs frequently?

Work out in advance a good rationale for your moves. People do change jobs and if your reasons are sound, say so. try not to be defensive, and most importantly... avoid long stories and negatives.

Tips for a Successful Interview

Company research
Know your background
Prepare business questions
The issue of salary in the interview
Know your strengths and weaknesses
What is your opinion of the last company you worked for?
Have you changed jobs frequently?
What kind of manager are you?
What motivates you?
What do you not like to do?
How did your boss, co-workers and subordinates get along with you?
What are your short, medium and long term goals?
Do you prefer working in small, medium or large companies?
Why do you want to work for our company?