The document discusses the characteristics, functions, types, and construction of questionnaires. It provides details on: - Questionnaires should be short, simple, objective and avoid embarrassing questions. - Functions include description and measurement of variables like attitudes and opinions. - Types include fixed-response and open-ended questionnaires, and mail-administered vs face-to-face. - Constructing a questionnaire involves deciding what to measure, the type, writing drafts, pretesting, and specifying procedures.