Meaning of “depth interview” in the English Dictionary

"depth interview" in Business English

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depth interviewnoun [ C ]

uk us also in-depth interview MARKETING

an 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.

(Definition of “depth interview” from the Cambridge Business English Dictionary © Cambridge University Press)