The U.S. Citizenship and Immigration Services (USCIS) processes petitions for immigrants wishing to live in the United States under permanent resident status under two basic processes, one for immigrants coming to the U.S. through family and the other for immigrants coming to the U.S. to pursue a permanent employment opportunity. In order to qualify for immigration through family, the foreign national must be sponsored by a family member who is either a U.S. citizen or a lawful permanent resident and submit Form I-130, Petition for Alien Relative to USCIS. Immigrant visa numbers are assigned by the State Department as available based on a preference categorization which tiers the application based on the type of relationship that the foreign national and the sponsor share. In order to immigrate through employment, a foreign national must be sponsored by a U.S. employer. The employer submits a labor certification request (Form ETA 750) to the Employment and Training Administration of the Department of Labor. Once the request has been certified, the employer submits Form I-140, Immigrant Petition for Alien Worker, to the USCIS. Immigration through employment is also prioritized by category of worker: EB-1 priority workers; EB-2 professionals with advanced degrees or persons with exceptional ability; EB-3 skilled or professional workers; and EB-4 special immigrants.