P: time-consuming, interview training required for best results
E: informed consent, unstructured allows rapport to be built, researcher with poor skills can cause distress, sensitive topics may be distressing
R: structured easily replicated, semi-structured/unstructured hard to replicated
V: verstehen, participants may change their answers to achieve social desirability
E: Making of a Moonie (Barker), 7 Up (semi-structured)
R: generally smaller samples, semi-structured/unstructured are quite personalised
T: positivist (structured), interpretivist (semi-structured/unstructured)