This report reviews the methodology and findings of four reports entitled the “International Housing Affordability Survey”, undertaken by a North American consulting firm, . The reports have been produced annually since 2005, with the most recent 2008 survey reporting data for the 3rd quarter of 2007. This report specifically reviews the validity and generalizability of the housing affordability data used and the causal interrelationships posited by the report authors. The underlying claim of the report is that differences in housing affordability of dwelling purchase price (for owner-occupation) across the six countries examined in the “surveys” are explained by differences in land supply and land use planning regulations.