This means that the employer has done or refused to do something in violation of the law which generally affects the larger group of class members, so that a class action lawsuit would allow the court in a single trial to fix the problem for everyone if the plaintiffs prove their case. In terms of fixing the problem, the court must be able to issue an injunction, which is an order directing the employer to stop its illegal conduct, that solves the problem, rather than only being able to remedy the problem by giving each class member money damages.