The NISRA data were collected as part of a wider research project on second homes in NI which also included surveys of second home owners within three case study areas, semi-structured interviews with key respondents in the case study areas, as well as other historical commentary and secondary data analysis (Paris, 2007a).
This is because both the NISRA and AuSSA surveys enable other researchers to include questions on an issue related to one of the topics covered in the questionnaire.
NISRA 2002-based household projections for 2006 and 2007 provided a basis for estimating that there were around 672,000 households in NI between January and April 2007.
The analysis of the AuSSA data was less straightforward than the NISRA data set as it could not be designed so specifically with regard to holiday homes, as other users were involved in question design.
The data from the NISRA and AuSSA surveys show that in NI and Australia this mobility is significant, for particular groups of people for investment and leisure purposes at different stage of the life course.