Semi-Structured: A guide is used, including themes to be explored. However, the researcher can ask for more detail and clarification about a question if need be. This type of interview is useful in socially sensitive issues, however it can cause issues if not enough time is allocated to a specific theme.
Focus Group: A group of around 6-10 people, lead by a facilitator who asks questions and leads discussion (with prepared prompts).
Narrative: An interviewer does not prompt questions but instead the interviewee tells a story or 'narrative'. It is an interpretation of a particular situation by a particular person, and the end result is a mixture of facts and interpretations.