Use Star technique, Situation, task, action, results. Most questions are generic enough it allows for flexible answers. Examples can from any situation. If you prep before imterviews are relatively easy.

Via over the telephone. Usual questions asked such as resolving a conflict, figuring out new assignment, ect. Although the questions were simple, they were difficult to answer over the telephone where you did not see any facial expressions, so you did not know whether the responses provided were satisfactory.