The HILDA Survey underwent two major changes in wave 9. The first was the change to a
new fieldwork provider and the second was a change of mode from pen and paper
interviewing (PAPI) to computer-assisted personal interviewing (CAPI). While the change of
mode was largely inevitable over the course of the project, the change of fieldwork provider
provided the impetus for the change of mode at the same time.
This paper describes the key differences in operations and provides an assessment of the
impact on the data quality.