Tammy,
Thanks again for taking the time to post such a detailed and helpful response. Your questions will definitely make the candidate think.
One of the best ways to predict future behavior is to look at past behavior. The theory here is that a person will generally react to a new situation in a similiar manner to how he or she reacted previously.
"Behavior-based interviewing" focuses questions on what people have done in the past instead of asking them to respond to hypothetical scenarios. Most of the questions start with "Tell me about a time when you ...."