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Interviewers have been known to falsify data, or skip questions to shorten tedious interviews. Monitoring interviewers helps to reduce this. Having a quality controller listening in on telephone interviewers is a widely used method. In face-to-face interviews, recordings can be made and selected täpes can be checked afterwards. Special verification contacts or re-interviews may be used to evaluate interviewer performance in large-scale face-to-face surveys (cf. Lyberg & Biemer, Chapter 22; Japec, 2005, p. 24). [CITATION Edi08 n y t l 1033 ] 17 Works Cited CITATION Edi08 n y t l 1033 : , [1], 18