Rule 23(c)(4) is the most underutilized tool in the plaintiffs' class action arsenal. When an action involves thousands of property damage claims sharing a common liability theory but presenting highly individualized damages, certifying liability as an issue class — rather than pursuing full 23(b)(3) class certification or abandoning class treatment altogether — can be the difference between vindicating the class's rights and leaving them to dissipate in a mass of individual proceedings.
Rule 23(c)(4): Text and Architecture
Federal Rule of Civil Procedure 23(c)(4) states, in its entirety: "When appropriate, an action may be brought or maintained as a class action with respect to particular issues." This spare sentence sits within the rule's subpart governing class certification orders and has generated a circuit split that the Supreme Court has repeatedly declined to resolve.
The text is deliberately minimal. The Advisory Committee Notes to the original 1966 version of Rule 23(c)(4) illustrated its application with a fraud class action in which liability could be adjudicated on a class basis while damages required individualized proceedings — the "carve at the joints" paradigm. The 2003 amendments renumbered the subparts but left the substance of what is now (c)(4) unchanged, declining a proposal that would have required predominance to be satisfied for the issue as to which class treatment is sought rather than for the action as a whole.
The Circuit Split: Broad Versus Narrow Approach
The division among the circuits reduces, in practical terms, to a single dispositive question: may a court certify an issue class under Rule 23(c)(4) when the claims as a whole do not satisfy Rule 23(b)(3)'s predominance requirement?
The Broad Approach: Second, Fourth, Sixth, Seventh, and Ninth Circuits
The overwhelming majority of circuits answer that question yes. The canonical formulation comes from the Second Circuit.
In In re Nassau County Strip Search Cases, 461 F.3d 219 (2d Cir. 2006), the Second Circuit held that "a court may employ [Rule 23(c)(4)] to certify a class as to liability regardless of whether the claim as a whole satisfies Rule 23(b)(3)'s predominance requirement." The Nassau County case involved a constitutional challenge to a blanket policy of strip-searching misdemeanor detainees. Even though individual detainees' damages would require highly individualized adjudication, the court certified the question of whether the policy existed and whether the county was liable for implementing it. The court reasoned that Rule 23(c)(4)'s "when appropriate" language grants district courts broad discretion to isolate common issues for class treatment, and that requiring predominance over the entire action — not just the certified issue — would render (c)(4) effectively superfluous.
The Seventh Circuit's approach is particularly significant for mass property claims. In McReynolds v. Merrill Lynch, Pierce, Fenner & Smith, Inc., 672 F.3d 482 (7th Cir. 2012), Judge Posner certified issues of whether two challenged corporate policies — a "team-based" compensation system and an account-distribution protocol — caused racially disparate effects, leaving individual employees' damages for subsequent adjudication. McReynolds demonstrates that issue class certification is not confined to government-actor cases; it extends to any context where the defendant's challenged practice is common to the class even if individual economic harm is not.
The Narrow Approach: Fifth and (Historically) Eleventh Circuits
The Fifth Circuit has articulated the minority position: an issue may be certified under Rule 23(c)(4) only if it satisfies Rule 23(b)(3)'s predominance requirement for that issue as part of the broader analysis, and the certified issue must be the predominant issue in the overall litigation. Castano v. American Tobacco Co., 84 F.3d 734 (5th Cir. 1996) — decided before the most current crop of (c)(4) decisions — has been read to require that issue certification not be used to artificially manufacture a predominant issue when the action as a whole would fail Rule 23(b)(3).
The Eleventh Circuit Position
The Eleventh Circuit's treatment of Rule 23(c)(4) is more complex and more favorable to plaintiffs than it might initially appear. The court has not adopted the Fifth Circuit's narrow position. In Williams v. Mohawk Industries, Inc., 568 F.3d 1350 (11th Cir. 2009), the court remanded a case for the district court to consider whether common issues predominated over individual issues and whether a hybrid class for injunctive relief was appropriate — an instruction that presupposes the availability of issue-based certification as a remedial option. A 2023 survey of appellate practitioners' briefing confirms that Eleventh Circuit district courts continue to grant Rule 23(c)(4) certifications in the appropriate case, with the majority applying some version of the "capable of class treatment" standard rather than a strict predominance-for-the-whole-action test.
The important caveat: the Eleventh Circuit appears to treat Rule 23(b)(3)'s superiority requirement as a genuine backstop to Rule 23(c)(4). Even if a court certifies a liability issue for class treatment, it must find that class adjudication of that issue is the superior method of resolving it. Issue classes whose certification would impose disproportionate burdens relative to the common benefit — creating bifurcated proceedings that are more expensive than individual adjudication — will not satisfy superiority.
Application to Hurricane Class Actions and Mass Property Claims
Rule 23(c)(4) is structurally suited to property damage class actions arising from hurricanes, industrial contamination, or other mass events. These cases typically present:
- A common causation question: Was defendant's conduct or omission — inadequate flood control infrastructure, negligent levee maintenance, release of a harmful substance — a cause of plaintiffs' property losses?
- A common liability question: Did defendant owe a duty of care, breach that duty, and thereby produce the kind of loss suffered?
- Highly individualized damages: Each property parcel has a unique pre-event value, unique proximity and exposure characteristics, unique post-event remediation costs, and unique ownership history.
Issue class certification for the causation and liability questions allows a mass event to be adjudicated efficiently as to the defendant's conduct, while individual plaintiffs prove their own damages through follow-on proceedings. The Second Circuit's Nassau County framework maps directly: "A court may employ [Rule 23(c)(4)] to certify a class as to liability regardless of whether the claim as a whole satisfies Rule 23(b)(3)'s predominance requirement."
For post-hurricane litigation specifically:
Defect or negligence in flood control structures. A class of property owners in an inundated neighborhood may share the common question of whether a federal agency, utility company, or municipality negligently designed or maintained a levee or flood-control structure. The causation question — did the structural failure cause water to enter the affected zone? — is common. Individual questions — was a given parcel damaged by the failure versus natural storm surge, how much, and to what value? — are not. Issue certification allows the common question to be resolved without requiring the court to try thousands of individual damages claims first.
Industrial contamination. A class of property owners near a contaminated site share common questions about the source and migration of contamination. Issue certification for the source-attribution and exposure-pathway questions is appropriate even where individual property contamination levels and remediation costs are highly variable.
Pleading and Motion Practice
Frame the certified issue precisely. The strength of a Rule 23(c)(4) certification depends on the court's confidence that the certified issue is genuinely separable from the individual questions remaining for subsequent adjudication. A vague issue class — "whether defendant was negligent" without specifying the precise conduct alleged — will face Rule 23 objections that the certified issue is simply the whole case restated. Identify the specific policy, practice, condition, or decision whose common-question character justifies class treatment.
Address preclusion effects on absent class members. Rule 23(c)(4) issue certification binds absent class members on the certified issue upon final judgment. Plaintiffs' counsel must ensure that the class definition, notice procedure, and opt-out rights satisfy due process and Rule 23's fairness requirements as to the specific binding issue. A class member bound on liability but not yet adjudicated on damages must retain the ability to contest causation as to her individual property if the certified issue was limited to general-causation or policy-level liability.
Use trial plans. Courts evaluating issue class certification will want to understand what a trial looks like. Plaintiffs should submit a trial plan explaining how the certified issue would be tried, how it dovetails with individual damages proceedings, and what judicial resources each phase requires. A well-structured trial plan is often the decisive factor in a close issue-class certification motion.
Preserve the 23(b)(3) argument in the alternative. Even where plaintiffs file for 23(c)(4) certification as the primary theory, the certification motion should argue in the alternative that if the court concludes predominance is satisfied for the entire action, full 23(b)(3) certification is appropriate. This preserves appellate arguments and may produce a better certification order.
Open Questions and Trajectory
The Supreme Court's repeated denials of certiorari on the circuit split suggest the Court is content to let the broad approach calcify into majority practice. For plaintiffs' practitioners, the practical consequence is that circuits applying the broad majority approach — including courts in the Eleventh Circuit — provide meaningful access to issue class treatment for mass property claims. The remaining uncertainty is doctrinal, not practical: how broadly "when appropriate" extends remains for future decisions to elaborate.
Talk to Yates Anderson
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Informational only. Not legal advice. No attorney-client relationship is created by reading this post. Consult a licensed attorney in your jurisdiction.