During the wal-mart case the Supreme Court ruled that the woman who was suing wal-mart could not move forward with the case as a class action lawsuit. In order to move forward with a class action lawsuit you need to have all members to share the same situation, meaning the members have to prove and share the same situation as the woman suing wal-mart (commonality). Commonality is when a group of people come together from a company and report the same exact situation because they all deal with it.