A "questionnaire survey" is a method to gather information or opinions from a group of people by giving them a set of questions to answer. It helps collect data and feedback on different topics or issues. Full definition
In order to meet this purpose, the study conducts questionnaire survey. (scirp.org)
Procedure: Data was collected from questionnaire surveys of 1283 adolescents (mean age 14.1 years). (scirp.org)
The subjects were randomly recruited from the more than 18,000 subjects participating in a larger questionnaire survey on asthma and allergies in Gothenburg and the general Vastra Gotaland region. (sciencedaily.com)