Grutter v. Bollinger, 539 U.S. 306 (2003), was a landmark case in which the United States Supreme Court upheld the affirmative action admissions policy of the University of Michigan Law School. Justice Sandra Day O'Connor, writing for the majority in a 5-4 decision and joined by Justices Stevens, Souter, Ginsburg, and Breyer, ruled that the University of Michigan Law School had a compelling interest in promoting class diversity. The court held that a race-conscious admissions process that may favor "underrepresented minority groups," but that also took into account many other factors evaluated on an individual basis for every applicant, did not amount to a quota system that would have been unconstitutional under Regents of the University of California v. Bakke.