Why Certification Is Everything
In class action litigation, class certification is the hinge on which the entire case turns. A certified class transforms individual claims worth a few thousand dollars into consolidated litigation worth millions. Denial of certification typically ends the case — no individual plaintiff can afford to litigate claims individually against well-resourced defendants. This dynamic means both sides invest disproportionate resources in the certification motion, and courts know it.
The Rule 23 Requirements: How Courts Actually Apply Them
Rule 23 requires four threshold prerequisites (numerosity, commonality, typicality, and adequacy) plus membership in one of three class types under Rule 23(b). In practice, numerosity and typicality are rarely contested seriously. The real certification battles are fought on:
Commonality After Wal-Mart v. Dukes
Dukes raised the commonality standard significantly — plaintiffs must show that class members have suffered "the same injury" and that the case will "generate common answers apt to drive the resolution of the litigation." Post-Dukes, commonality is most easily satisfied when liability turns on a uniform policy, practice, or defendant conduct that applied to all class members in the same way.
Commonality is hardest to satisfy in cases where individual supervisory decisions (Dukes itself), individual misrepresentations (many consumer fraud cases), or individualized damages calculations dominate the class claims. Courts are particularly skeptical of certification in cases where proving any individual class member's claim requires substantial individualized inquiry.
Predominance Under Rule 23(b)(3)
The most contested certification question in most Rule 23(b)(3) class actions is whether common questions predominate over individual ones. Comcast Corp. v. Behrend added the requirement that damages be calculable on a classwide basis using a methodology consistent with the liability theory — a requirement that has generated significant expert witness litigation at the certification stage.
The predominance analysis has become heavily intertwined with merits analysis — courts now conduct meaningful examination of whether the common liability theory is actually tenable before certifying the class that would litigate it. This has substantially increased the pre-certification discovery burden for plaintiffs.
What Drives Certification Success
Analysis of certification decisions across federal circuits reveals consistent predictors of success:
- Uniform written policy or practice: Cases challenging a written uniform policy (pricing practice, employment policy, data handling practice) achieve certification at substantially higher rates than cases based on inconsistent individual conduct
- Strong expert support: Certification decisions increasingly turn on which side has the better expert on damages methodology. Expert exclusion at certification is highly correlated with certification denial
- Well-defined class: Classes defined with bright-line objective criteria (all purchasers of X product between dates Y and Z) certify at higher rates than classes requiring individualized assessment of membership
- Circuit: The Second, Seventh, and Ninth Circuits have historically been more receptive to certification than the Fifth, Sixth, and Eleventh — forum selection when possible matters
Defense Strategy at Certification
Effective defense at certification focuses on: developing evidence of individualized variation in liability or damages; challenging plaintiff's expert methodology on damages calculability; identifying named plaintiffs with adequacy or typicality problems; and where possible, pointing to merits weaknesses that undermine the "common question" frame. The goal is not necessarily to defeat certification entirely — settlement following certification is often the outcome — but to negotiate certification from the strongest possible position.