A Practice Note discussing immigrant visa petitions based on certified PERM labor certification applications filed on Form I-140, Immigrant Petition for Alien Workers. These petitions are used by employers to sponsor foreign nationals as advanced degree professionals, individuals of exceptional ability, professionals, skilled workers, or unskilled workers following the employer's test of the US labor market. This Note describes the petition process and how the foreign worker acquires lawful permanent resident (LPR) status in this category.