In-depth interviewing is a method of qualitative research in which the researcher asks open-ended questions orally and records the respondent's answers. Interviewing is typically done face-to-face, but can also be done via telephone. In-depth interviews are different from survey interviews in that they are less structured. In contrast to survey interviews, where the questionnaires are rigidly structured, in-depth qualitative interviews are flexible and continuous. They are not locked in stone and are often not prepared in advance. Read more about in-depth interviews and the steps involved in conducting them.