At high levels, issues that relate to personality and temperament become more important than they might otherwise. The recruiter wants to know if you will fit in with the client company. The recruiter may also be fishing for signs of conflict that indicate a potential personality problem.

Be honest and straightforward, but do not dwell on any conflict that may have occurred. Highlight positive developments that resulted from your departure, whether it was that you accepted a more challenging position or learned an important lesson that helped you to be happier in your next job.