The reliability of Census data on demography and migration comes under attack periodically. This article sheds light on the reliability of survey results with respect to migration into the Western Cape. Census data and two independent studies are compared and the convergence or divergence of the findings assessed. There is greater consistency for more aggregate-level measures than for disaggregated measures (whether by geographical unit or by race). Such comparisons of surveys are important for gauging the reliability of our knowledge of migration.