Have no standardised format providing the interviewer freedom, this means rich and detailed qualitative data
Informality allows rapport to develop, the interviewee is likelier to open up (e.g. sensitive topics)
Training needs to be thorough and require good interpersonal skills to establish rapport
Longer than Sis meaning smaller sample size
Large amounts of data produces, making analysis cand catgorisation of data harder
They are flexible, new hypothesis can be developed/tested as they arise (valid data too as the interviewer/interviewee can clarify meanings)
Useful for unexplored subjects as they are open ended and exploratory
Opportunities for interviewee to speak about what they consider important (no pre set Qs)
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