Mixed modes and measurement error: using cognitive interviewing to explore the results of a mixed modes experiment
The role of the interviewer in producing mode effects: results from a mixed modes experiment comparing face-to-face, telephone and web administration
Effects of visual and aural communication of categorical response options on answers to survey questions
Is it a good idea to optimise question format for mode of data collection? Results from a mixed modes experiment
The importance of experimental control in testing the impact of interviewer continuity on panel survey nonrepsonse