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Annamaria Bianchi, Silvia Biffignandi and Peter Lynn


Sequential mixed-mode designs are increasingly considered as an alternative to interviewer-administered data collection, allowing researchers to take advantage of the benefits of each mode. We assess the effects of the introduction of a sequential web-face-to-face mixed-mode design over three waves of a longitudinal survey in which members were previously interviewed face-to-face. Findings are reported from a large-scale randomised experiment carried out on the UK Household Longitudinal Study. No differences are found between the mixed-mode design and face-to-face design in terms of cumulative response rates and only minimal differences in terms of sample composition. On the other hand, potential cost savings are evident.

Open access

Martin Karlberg, Silvia Biffignandi, Piet J.H. Daas, Anders Holmberg, Beat Hulliger, Pascal Jacques, Risto Lehtonen, Ralf T. Münnich, Natalie Shlomo, Roxane Silberman and Ineke Stoop