Structured interviewing (also known as standardised interviewing or researcher administered survey) is a quantitative research method commonly employed in survey research. The aim of this approach is to ensure that each interviewee is presented with exactly the same questions and this ensures that answers can be reliably aggregated. Quantitative research is based on the numerical representation of observations for the purpose of describing and explaining the phenomena. ... Statistical surveys are used to collect quantitative information in the fields of marketing, political polling, and social science research. ...

Structured interviews are essentially statistical surveys, where the survey is delivered by an interviewer rather than being self-administered (like questionnaire). Interviewers read the questions exactly as they appear on the survey questionnaire and answers to questions are often fixed in advance. Statistical surveys are used to collect quantitative information in many fields including political polling and government, health, social science and marketing research. ... A questionnaire (also known as self-administered survey) is a type of survey handed out in paper form usually to a specific demographic to gather information in order to provider better service or goods. ...