Phone surveys Multiple call backs are needed. Impersonal nature must be overcome through verbal communication. Instructions must be very clear. Interviewer must be prepared for distractions and work to keep the respondents interest. Interviewer training is extremely important.
Standardized procedures are more effective.
Respondents start to drift away after 30 minutes. The presence of the interviewer may influence the results. Every respondent should have the same interview experience. Interviews should be personal and engaging yet consistent and nonreactive. Researchers must balance rapport and control.