Respondent Caroline Behrend et al., cable television subscribers, brought an antitrust class action against Petitioner Comcast Corporation alleging anticompetitive activity. In order to be certified as a class, Respondents had to present evidence that they suffered damages on a class-wide basis. The evidence they submitted consisted of a damages model prepared by their expert witness. Comcast challenges the District Court’s reliance upon that evidence, claiming that it is inadmissible under standards set forth in Federal Rule of Evidence 702 and Daubert v. Merrell Dow Pharmaceuticals, Inc., 509 U. S. 579 (1993). In this case, the Supreme Court will address whether evidence presented in support of class certification must be admissible under those standards. The decision will likely significantly impact the ability of plaintiffs to certify as a class under Federal Rule of Civil Procedure 23, and it may also affect underlying commercial conduct, such as the future use of territory-swapping and clustering agreements.