The Harvard-MIT Data Center is a distributor of quantitative social science data from major international data consortia for Harvard and MIT. Its main mission is to create, and make widely accessible, statistical and analytical tools for the social and health sciences; and to use these tools for understanding and solving major problems that affect society and the well-being of human populations. This is a very large and integrated database, providing access to a great amount of statistics and data collected from prestigious International sources. Information is extremely rich in reference material for further research. The HMDC also maintains a large library of electronic data and a growing collection of unique data sets and provides computer support to several of Harvard’s social science departments, research centers, and schools. While overall information, research summary and other electronic resources are available freely over the Internet, many more data are restricted to members of the MIT and Harvard communities.