Nondirected Interviews: How to Get More Out of Your Research Questions
http://www.adaptivepath.com/publications/essays/archives/000041.php

Kuniavsky, Mike
Adaptive Path
2002

Abstract:

As user experience designers, a key component to nearly all the techniques we use in our practice is the one-on-one interview. It's the basis of requirements gathering, usability testing, and task analysis. In order to remove our personal biases, expectations and opinions from the questions asked, I practice a kind of questioning technique called the nondirected interview. The questions asked are at the heart of any interview. Following are a loose set of guidelines to help you frame questions in a way that elicits honest and accurate responses.