Types of surveys
In general, surveys can be broken down into two categories: questionnaires and interviews. Questionnaires are typically paper and pencil or electronic surveys that the respondent completes on their own. Interviews, on the other hand, are surveys that are completed by the interviewer based upon what the respondent says.
Questionnaires
Pros:
- Inexpensive to administer
- Can reuse instrument on wide number of people
- Respondent can fill it out at their convenience
Cons:
- Low response rates
- Not best when asking for detailed written responses
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Interviews
Pros: 
- Opportunity to ask follow-up questions
- Easier way to get opinions or impressions
- Respondent can fill it out at their convenience
Cons:
- Time consuming
- Resource intensive
- Interviewer must be trained in how to respond
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