+A **questionnaire** is a research instrument consisting of a set of questions, designed to collect information from respondents. It is a primary tool in [Survey Research](/wiki/survey_research) and [Data Collection](/wiki/data_collection), used to gauge opinions, behaviors, or facts.
+## See also
+- [Interview](/wiki/interview)
+- [Statistics](/wiki/statistics)
+- [Research Methods](/wiki/research_methods)
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