Advantage of Mail Interview:

1. Relatively low cost.
2. Can be accomplished with minimal staff and facilities.
3. Provides access to widely dispersed samples and samples that for other reasons are difficult to reach by telephone or in person.
4. Respondents have time to give thoughtful answers look records or consult with other

Disadvantages of Mail Interviews:

a. Ineffective as a way of enlisting cooperation ( depending on group to be studied).
b. Various disadvantages of not having interviewer involved in data collection.
c. Need for good mailing addresses for sample.