IPUMS-International is a project to inventory, preserve, harmonize and disseminate census microdata from around the world. IPUMS-International makes cross-national census microdata readily accessible and usable. The project facilitates comparative international research based on pooled microdata. A harmonized composite coding system for variables allows comparisons over time and across countries without loss of information. A series of constructed pointer variables allows users to identify relationships among spouses, parents, and children. Extensive documentaton aids in the interpretation of data and highlights major compatibility issues A web-based dissemination system provides convenient and free access to both the microdata and the documentation.