Do you know elaborated research using the method of the "Comprehensive Interview" (l'entretien compréhensif / "Verstehendes Interview") of Jean-Claude Kaufmann?
Żadkowska, M. (2017). Kaufmann’s comprehensive interview applied in a longitudinal study of migrant couples: notes from the field. Romanian Journal of Population Studies, 11(1), 59-78.
Article Kaufmann’s Comprehensive Interview Applied in a Longitudinal...
Zadkowska, M. (2012). Couples and their Laundry. On Contemporary Family and Everyday Duties in Jean-Claude Kaufmann'Sociology. STUDIA SOCJOLOGICZNE, (2), 143-165.
Article Couples and their Laundry. On Contemporary Family and Everyd...
Perhaps contact Dr Magdalena Zadkowska
at ResearchGate or https://ug.edu.pl/pracownik/3372/magdalena_zadkowska?language=en
I'm vaguely (past) familiar. I want to read Mary Wilson's suggestions first before making any further commentary and would have to have a little more info on what you're doing, intentions and purpose. From what I think I remember, it's fairly empirical based, inductive, and somewhat more deeply, emotively (in a sense), and dialectically engaging to elucidate in-depth 'understanding', deep/thick data, richer data... and so forth. I'm an anthropologist and do a vast amount of face to face interviews from ethnographic field research while on an archaeology project to military combat environment multidisciplinary social science interviews with farmers, villagers, shopkeepers, civil servants, soldiers, politicians, foreign militaries, insurgents, warlords, etc.; and a lot of work on ecological and economic ethnography (modern urban cites to remote tribal areas). Depending on what the purpose and intentions are, the possibilities of good data for those purposes and hypotheses, etc., the nature and cultural aspects of the people, subjects, interviewees... (simply a lot of factors you need to figure out and understand in advance), I borrow from many methods and partially reinvent for every discrete project. Nothing wrong with that, and there are a lot of useful methods and techniques to draw from. It's also personal personality driven. Some people are great interviewers and some people suck no matter how much training and experience; and, respondents will react, share, lie, ignore, provide solid honest opinions and feedback, represent diversity or consistency, etc. based on how they perceive and trust the interviewer, and, will provide variable data (subjective and quasi-objective) to varying degrees depending on their own personality-driven perspectives, intentions, and so on. Participant observation is still highly effective, but it takes a lot of time to do the fieldwork. A lot of people now are going for the short-term vacation-dissertation and expedient rapid data collection, reliance on big data versus deep/thick data, etc. Over the decades, I've seen a lot of quality and accuracy slide because of this. Hope this helps.