' written answers that depend on respondents being able to read and understand correctly. may be distributed by hand, posy or distribution point. once completed they can be returned by post or collected by hand. questions can be open or closed.
+ quick and easy
+ easily repeated
+ very large samples can be used
+ loads od info can be gathered
+ people who are geographically distant can be studied
- sample will be biased because it relies on people returning them
- DC
- lacks population validity
- people may not give honest answers
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