People readily describe what they would do in the future but are poor at predicting their own behavior. That is why a good interview relies on past experience.
Instead of "Would you use this feature?" ask "Tell me how you solved this problem the last time." A concrete story reveals real motives and barriers.
Avoid leading questions, do not argue and do not explain the product. A pause after an answer often brings the most valuable addition.
An experienced moderator notices contradictions between words and actions — that is where insights are most often found.
