One on One interview.

When we did the one on one interview i found it was much better than the questionnaire technique because in the interview you can use follow on questions, or when your interviewing you could think of a question you havent before and where it isnt on paper you are able to just ask it. Sometimes though the fact that the interviewee cant be kept annonimous they wont be as comfortable answering quetions like do you download illegally. Because obviously they dont want people to know they are doing something illegal. I found it better than the questionnaire technique but it can be hard to get the answer you want out of them.