depth interviewnoun [ C ]
ukusalso in-depth interview MARKETINGan occasion when someone is asked detailed questions, for example, about the products or services that they buy or would like to buy:
Depth interviews are a useful type of qualitative market research, and are often to be preferred to focus groups.
depth interviewing
noun [ U ] also in-depth interviewing
Depth interviewing often requires repeated sessions with the interviewee.