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Interviewing top-ranking business executives raises several problems of procedure, among which are: enlisting co-operation, preliminary preparation, qualifications of respondents, and multiple respondents. Practical resolution of these and other problems was achieved largely on a trial-and-error basis. The use of two interviewers, or tandem interviewing, elimanates a major source of bias inherent where there is a single interviewer and contributes to the efficiency with wich data are gathered and analyzed. Other decisive conditions are the sponsorship and affiliation of the researchers, the practical emphasis given to the subject, and the competence of the interviewers.
Kincaid et al. (Fri,) studied this question.