General Guidelines for Conducting Interviews
http://www.mapnp.org/library/evaluatn/intrview.htm

McNamara, Carter
Management Assistance Program for Nonprofits
1999

Abstract:

Interviews are particularly useful for getting the story behind a participant's experiences. The interviewer can pursue in-depth information around a topic. Interviews may be useful as follow-up to certain respondents to questionnaires, e.g., to further investigate their responses. Usually open-ended questions are asked during interviews. Before you start to design your interview questions and process, clearly articulate to yourself what problem or need is to be addressed using the information to be gathered by the interviews. This helps you keep clear focus on the intent of each question.