Yes, particularly for qualitative research studies involving people and complex topics (such as psychology). The research design typically allows for a small sample size of people (since this type of research is time consuming). The interview can range from a set list of questions to very unstructured (letting the participant guide the discussion). In-depth interviews can be administered by a researcher, a non-bias moderator, or by the use of technology. Then, the audio recordings from the interviews are then turned into interview transcripts, which can be used for analysis and conclusion purposes.