· If the respondent lacks reading skills to answer a questionnaire.
· Are useful for untangling complex topics.
· The Interviewer can probe deeper into a response given by an interviewee.
· Interviews produce a higher response rate.
· The interviewer can affect the data if he/she is not consistent.
· It is very time consuming.
· It is not used for a large number of people.
· The Interviewer may be biased and ask closed questions.