UPDATE:

You may have heard the cheers emanating from Bentonville, Arkansas (the location of Wal-Mart's corporate headquarters), and the corporate headquarters of other large employers following the United States Supreme Court’s announcement of its decision in Wal-Mart, Inc. v. Dukes, U.S. (2011) (PDF). On June 20, 2011, the Court decertified the class-action status of the 1.6 million current and former female employees in their decade-old suit against the world’s largest private employer. Betty Dukes and her two co-plaintiffs had alleged a nationwide pattern of discriminatory pay and promotion practices by the company, despite its published policy of non-discrimination. However, the Court unanimously disagreed and overruled the Ninth Circuit Court of Appeals, which had allowed the case to proceed as a class action. The decision created what may be viewed as a higher burden of proof for establishing class action status.

While the Court was unanimous in deciding that this particular class should be decertified, only five of the justices joined in the entire ruling. In the majority opinion authored by Justice Scalia, the Court found that commonality was the key to certifying a class under Federal Rule of Civil Procedure 23 – “claims must depend on a common contention . . . which means that determination of its truth or falsity will resolve an issue that is central to the validity of each one of the claims in one stroke.” To attempt to resolve “literally millions of employment decisions at once” would not result in a unified answer for why a particular employee was disfavored. “Without some glue holding together the alleged reason for those [discriminatory] decisions, it will be impossible to say that examination of all the class members’ claims will produce a common answer to the crucial discrimination question.” The Court noted that the dissent from the lower court was correct in that the plaintiffs had “little in common but their sex and this lawsuit.”