The decision to emigrate depends both on where the potential immigrant is going and where he or she is coming from. Changes in the conditions and laws in a given country affect people differently in different countries, depending on the conditions and laws there. Yet, when collecting information about immigration, countries tend to be interested only in their own policies, and they tend to track only the total immigrant flows across their own borders. No one nation has much incentive to collect, reconcile, or share detailed information about what is happening elsewhere. This grant to the International Migration Institute at Oxford University supports the work of a team lead by Hein de Haas to compile information about the flow patterns and the policy determinants of high-skilled immigration, concentrating on relocation decisions by students and academics. The project, called DEMIG, studies the "DEterminants of International MIGration" by producing sharable datasets that are bilateral and longitudinal, i.e., that record both sending and receiving information between pairs of countries repeatedly over time. Funds from this grant will allow de Hass and his team to extend DEMIG's Migration Flow Database to include skill indicators like education and employment, and extend DEMIG's Policy Database beyond immigration laws to track factors like fellowship or research funding levels that can specifically influence student and faculty mobility decisions.