Generally, this would be expected to increase the percent of people who are willing to respond. Interviews Interviews are a far more personal form of research than questionnaires. In the personal interview , the interviewer works directly with the respondent. Unlike with mail surveys, the interviewer has the opportunity to probe or ask follow-up questions. And, interviews are generally easier for the respondent, especially if what is sought is opinions or impressions.
Interviews can be very time consuming and they are resource intensive.
The interviewer is considered a part of the measurement instrument and interviewers have to be well trained in how to respond to any contingency. Almost everyone is familiar with the telephone interview . Telephone interviews enable a researcher to gather information rapidly. Most of the major public opinion polls that are reported were based on telephone interviews. Like personal interviews, they allow for some personal contact between the interviewer and the respondent.