Readers of this blog know that I’ve been an early (and ardent) advocate of challenging poorly-conceived class actions as early as possible. And, during the last three to four years, the motion to strike class allegations has (with good reason) become a popular tactic among defense counsel. And, several months ago, we got one

Commonality is rarely the subject of much discussion in class certification. The plaintiff often treats it as a perfunctory hurdle, subsumed into the more difficult questions of predominance (under Rule 23(b)(3)) or cohesiveness (under Rule 23(b)(2)).  But, much like numerosity, commonality is a requirement that may reward careful scrutiny when a defendant opposes class certification.