This document discusses the questionnaire method for collecting data in survey research. It defines a questionnaire as a set of written questions used to collect primary data for investigation. The key steps in constructing a questionnaire are: determining the scope, deciding question types, drafting, pretesting, revising, distributing, collecting responses, analyzing data, and writing a report. Questionnaires should be concise to improve response rates but comprehensive enough to answer the research questions. Covering letters are important to explain the purpose and ensure confidentiality. Common questionnaire types include mailed, group-administered, and personal contact questionnaires.