The objective of this research is to apply economic models and available data from multiple sources to understand the different channels of adjustment that determine the flows of individuals from overseas and from within the U.S. into the S&E workforce. In particular, our research approach focuses on the link between the labor market and university education for both U.S.-born and foreign-born workers and incorporates decisions of U.S. students to pursue training in S&E fields, the supply side of U.S. colleges and universities, the role of the expansion of post-secondary training abroad in affecting the potential supply of workers in the U.S., and U.S. immigration policy, including the availability of student visas, work visas, and prospects for transitioning to permanent residency affect immigration decisions.