Third Circuit Sets Framework for Numerosity Inquiry and Lists Factors to Consider When Determining “Whether Joinder would be Impracticable” Under Rule 23(a)(1)
One of the prerequisites for class certification under Rule 23(a) is that “the class is so numerous that joinder of all members is impracticable,” which is commonly referred to as the “numerosity” requirement. Notably, Rule 23(a)(1) is “conspicuously devoid of any numerical minimum required for class certification.” For the first time, the Third Circuit has “provide[d] a framework for district courts to apply when conducting their numerosity analyses” in a recent precedential opinion. Defendants opposing class certification must be aware of this framework, particularly since numerosity is an often overlooked prerequisite yet may provide ample grounds for defeating certification in certain actions.