Designing interviews

Just like most things in academia, writing interview questions is trickier than it might seem! As much as I'd love to channel my inner Larry King or Katie Couric or US Magazine journalist and sit down with a coach or teacher and just ask them a million questions---in the research world, it gets tricky. I want my questions to be open-ended, but I need some specific answers about certain issues. On the other hand, I don't want my questions to be judgmental or critical at all! I also want to leave time to ask about stuff I've observed, and I think those questions will be the most fruitful. Through it all, I'm attempting to stay organized by keeping a running list of all possible questions.