To date, face-to-face interviewing has been the primary mode of data collection for Understanding Society. There may be advantages in instead collecting data online where possible. Primarily, this should bring a reduction in data collection costs. There are, however, concerns that response rates could fall if the request to participate is no longer made in person and that measurement could differ between modes. Wave 5 of the Innovation Panel incorporated an experimental design comparing a mixed mode design (web plus face-to-face follow-up) with a standard face-to-face design. This paper presents initial findings from the experiment, primarily with regard to participation rates.