This technical brief provides guidance on the recommended questions for inclusion in censuses in order to improve the quality and comparability of data on disability and international migration. It also encourages the inclusion of questions on age at first marriage, type of marriage, and registration status of the marriage in the 2020 round of census. 

This technical brief discusses the opportunity provided by the 2020 census round to significantly increase the availability of high-quality, timely and reliable data disaggregated by migratory status and other characteristics relevant in national contexts. 

This paper introduces key concepts and variables to achieve international data comparability, which requires that national statistics offices work with the same concepts and definitions. It covers essential concepts for the measurement, analysis and tabilation of internal and international migration.

This technical note is part of a series on Select Topics in International Censuses, exploring matters of interest to the international statistical community.