Compared to the Questionnaires, a one on one interview is much easier and more effective to do. Your able to get in depth answers from your person and information you wouldn't be able to see on a questionnaire. Another good thing about it is that you can follow up on peoples answers and ask them another question to find more information.
A disadvantage about a one on one interview is that people may be uncomfortable because there not anonymous and may not want to be fully truthful. Whereas with a questionnaire because it is anonymous they will put the truth knowing no one will know its them.
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