Ask people for their opinions, to help their self-confidence.
Ask them for favors, to arouse their cooperativeness.
Ask them “and, in addition to that?” to get to the bottom of things.
Try giving orders in the form of questions to keep cooperation.
Make suggestions to the boss in the form of questions.
Ask questions that will let people talk themselves into a cooperative attitude.
~ Donald A. Laird , The Technique of Handling People