Hnot v. Willis Group Holdings Ltd.  ·  2007-03-08  ·  S.D. New York  ·  pin 228 F.R.D. at 476

“To obtain class certification, plaintiffs must demonstrate that the class meets the express requirements of Rule 23(a), known as numerosity, commonality, typicality, and adequacy, and of one of the subsections of Rule 23(b).”