What is the main purpose of a questionnaire?

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Tags

1. #scores
2. #obtain
3. #mailed
4. #response
5. #questions
6. #opinions
7. #designed
8. #often
9. #overall
10. #respondents
11. #respondent
12. #measure
13. #attitudes
14. #approach
15. #answers
16. #summed
17. #scored
18. #lower
19. #questionnaires
20. #although