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nformal, conversational interview - no predetermined questions are asked, as a way to remain as open and adaptable as you possibly can to the interviewee’s nature and priorities; during the interview the interviewer “goes with the flow”.
General interview guide approach - intended to ensure that the same general areas of information are collected from each interviewee; this provides more focus compared to conversational approach, but still allows a qualification of freedom and suppleness in getting the info from your interviewee.