In evaluation research, the interview is an instrument used to assess data on the implementation process and outcome. Interviews can differ in their degree of standardisation (structured, semi-structured or unstructured interviews/indepth), the type of contact (face-to-face, telephone or written), or the number of people interviewed at the same time (individual or group interviews).
Semi-structured interview: The interviewer asks a number of open-ended questions and follows up on areas of interest in response to the information given. It allows more flexibility than a structured interview, which involves asking pre-set questions.
Indepth interview: A qualitative research technique that involves a detailed, face-to-face conversation between a researcher and a respondent on a particular issue or topic. It does not use pre-set questions.
Structured interview A research technique in which the interviewer asks all study participants a list of pre-set questions.