The USA grants foreign MS/PhD students permanent residency through the National Interest Waiver (NIW). But there is an ambiguity on what constitutes "National Interest". Here are 6 factors that have been considered to be in "National Interest" from successful NIW cases.
Sidebar: USCIS leaves the test for "National Interest" as flexible as possible, hence, the burden of proof lies with the applicants to show why their admission into the USA will fulfill this test. At least one of the following may be argued in the NIW petition.
1. Your permanent admission into the USA has been requested by a U.S government agency (Federal, State, County, and City) interested in your skills/training or project.