Written sets of questions designed to gather information from respondents for research, surveys, or data collection purposes.
From French questionnaire, formed from question plus the suffix -aire. The French term emerged in the 18th century as systematic data collection became important for government and scientific research, reflecting the Enlightenment emphasis on empirical knowledge gathering.
The questionnaire format revolutionized social science by making it possible to gather standardized data from large populations, but it also introduced the challenge of response bias where people answer what they think is expected rather than their true feelings. Modern online questionnaires can now adapt questions in real-time based on previous answers, creating personalized data collection experiences.
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