Rule 23.Class actions
Group 4: Parties · Last amended September 1, 2017 · Last verified July 13, 2026
Full Text of Rule 23
Amendment History
Prior: RPPP Rule 23. Adopted May 5, 1967, effective July 1, 1967; amended December 1, 2005, effective January 3, 2006; amended, effective April 28, 2015; amended June 1, 2017, effective September 1, 2017.
Plain-English Summary
A class action lets a small number of named plaintiffs stand in for a much larger group of people with similar claims. Rule 23 doesn't let that happen automatically — it requires the class to clear four hurdles first. The class has to be so large that joining everyone individually would be impracticable. There has to be at least one question of law or fact common to the whole class. The claims or defenses of the representative plaintiffs have to be typical of the class as a whole, not some outlier situation. And the representatives, along with their lawyers, have to be capable of adequately protecting everyone else's interests.
Clearing those four hurdles isn't enough by itself — the case also has to fit one of three categories. The first covers situations where separate lawsuits would risk inconsistent rulings that leave the defendant with conflicting obligations, or where a ruling in one person's case would effectively decide the outcome for everyone else in the class. The second covers cases seeking injunctive or declaratory relief, where the party opposing the class has acted or refused to act on grounds that apply across the whole class. The third — the type most people picture when they hear 'class action' — requires that common questions predominate over individual ones, and that a class action is the best available way to resolve the dispute, taking into account how much individual class members want control over their own case, how much related litigation already exists, whether concentrating everything in one court makes sense, and how hard the class action would be to manage.
For that third category, Rule 23 requires the best notice practicable to the class, including individual notice to anyone who can be identified without unreasonable effort. The notice has to tell class members they can opt out by a set date, that the judgment binds everyone who doesn't opt out, and that they can appear through their own lawyer if they want. Certification orders can be conditional and revised before the case is decided, cases can be split by issue or into subclasses, and a certified class action can't be dismissed or settled without court approval and notice to the class.
Rule 23(f) addresses a problem specific to consumer and similar class settlements: money set aside for the class that nobody claims. Once the claims process runs its course and money is still left over, at least fifty percent of those residual funds must go to the Legal Foundation of Washington, which funds programs that give low-income Washington residents access to the civil justice system. A court can send the remaining share to the Legal Foundation as well, or to another organization whose work connects to the underlying case — but nothing in the rule forces a settlement to create residual funds in the first place; parties can structure a settlement so there's nothing left over to distribute.
Frequently Asked Questions
What are the four requirements a class must meet under Rule 23(a)?
Numerosity (the class is too large for individual joinder to be practical), commonality (a shared question of law or fact), typicality (the representatives' claims or defenses match the class as a whole), and adequacy (the representatives will adequately protect the class's interests).
What are the three types of class actions under Rule 23(b)?
One where separate suits risk inconsistent rulings or would effectively decide the case for absent members; one seeking injunctive or declaratory relief against conduct that applies to the whole class; and one where common questions predominate over individual ones and a class action is the superior way to resolve the dispute.
Do class members have to be individually notified?
In a class certified under the predominance-and-superiority category, yes — the court must direct the best notice practicable, including individual notice to anyone who can be identified through reasonable effort, and that notice must explain the right to opt out.
Can a class action be settled without a judge's approval?
No. Rule 23(e) requires court approval before a class action can be dismissed or compromised, and notice of the proposed dismissal or settlement must go out to the class.
What happens to money from a class settlement that no class member claims?
Rule 23(f) calls that money 'residual funds.' Once the claims process is exhausted, at least fifty percent of any residual funds must be disbursed to the Legal Foundation of Washington, which supports access to the civil justice system for low-income residents. The court decides where the rest goes, which can also be the Legal Foundation or another entity connected to the case.
Does every class settlement have to leave residual funds?
No. Rule 23(f)(1) makes clear that nothing in the rule stops parties from structuring a settlement that doesn't create residual funds at all.
Can a class action be limited to certain issues instead of the whole case?
Yes. Rule 23(c)(4) allows a class action to be maintained on particular issues, or lets the court divide the class into subclasses that are each treated as their own class.