Open questions in the beginning to understand your feedbacker.
These are examples of some initial question to set the tone and see the scope of the user need.
1. What is the feedbackers relation to the problem or the solutions possible? And from what angle?
2. How do the feedbacker or related users solve the problem today? Do they seem to have a solution already? If yes, how much time and energy does that take from them? This may tell a lot about how much your product could simplify the everyday life of future clients.
3. In order to uncover risks with your product and the use of it, be honest and ask about any fears that your product might create.
Got it? Move on to step two here.