There are many types of employment-based green card cases, along with waiting lists for most categories. Some of the categories require sponsorship by a prospective employer or organization, while some categories of green card cases permit the applicant to sponsor themselves. Many cases require that the sponsoring employer test the U.S. labor market. Other types of cases require that the person applying for the green card have extraordinary ability in their field of endeavor, such as scientists and famous performers. Green cards can also be granted persons who have maintained an executive or managerial position with a parent company abroad and are being transferred to fill an executive or management position with a subsidiary or affiliate company in the United States. Certain religious workers qualify for green cards, as well. Employment-based green card cases include: