weaknesses of interviews:
-lot of time and expense involved when training interviewers, to conduct unstructured interviewers in particular.
-Social desirability bias can be a problem with self-report techniques
-Interview data can be a time-consuming task to analyse and interpret when it is so detailed (and in a qualitative [written] format).
-require participants to have basic competencies to be successful (e.g. adequate communication skills, memory, honesty) could potentially limit the sample’s size and representativeness of the population.