In the Wal-Mart case (Wal-Mart v. Dukes), the Supreme Court decided that the group of female employees could not move forward as one big class-action lawsuit. The main reason was something called “commonality,” which basically means that everyone in the group has to share the same legal issue in a way that can be answered all at once. The women argued that Wal-Mart had a company-wide culture of gender discrimination, but the Court didn’t agree that this was enough. It said that because pay and promotion decisions were made by many different managers in different stores, each woman’s experience was too different. In other words, there wasn’t one clear, shared reason explaining why all of them were treated unfairly. The Court said a class-action case needs a kind of “glue” that connects everyone’s claims with the same cause and the same answer, and here, it believed that glue was missing. So even though discrimination might have existed, the Court ruled that the women couldn’t sue together as one group, which made it much harder for large groups of workers to challenge big companies over widespread issues like discrimination.