A definitive judgment on the merits rendered in a class action concludes all members of the class, whether joined in the action or not, if the members who were joined as parties fairly insured adequate representation of all members of the class.
Art. 597.Effect of Judgment
Title II. Actions · Chapter 5. Class and Derivative Actions · Amendment history unavailable · Last verified July 30, 2026
In one sentenceArticle 597 gives a definitive judgment on the merits of a class action binding effect over every member of the class, whether joined by name or not, so long as the members who were parties adequately represented everyone else's interests.
Full Text of Art. 597
Plain-English Summary
Article 597 states the payoff of the whole class-action mechanism in a single sentence: a definitive judgment on the merits binds every class member, including the many who were never individually named or served, as if each had litigated the case in person. Without this rule, a class action would settle nothing for anyone but the named representatives, and every absent member would remain free to relitigate the same questions later.
That binding effect comes with a built-in condition. The judgment concludes absent members only if the members who did appear as parties adequately represented the interests of the class as a whole. That condition is what makes the earlier articles in this Chapter — the adequacy prerequisite in Article 591, the court's oversight of certification and settlement in Articles 592 and 594 — more than paperwork. They exist to make sure the representation held up in practice, so that the binding effect Article 597 promises can withstand a later challenge.
Frequently Asked Questions
Who is bound by a class-action judgment in Louisiana?
Every member of the class, whether or not they were individually joined as a party, as long as the judgment is a definitive one on the merits and the members who did appear adequately represented the class.
Can an absent class member later argue they were not bound by the judgment?
An absent member can challenge the judgment's binding effect by arguing that the representation was not adequate, but the ordinary rule is that a definitive judgment on the merits concludes every class member once adequate representation is shown.
Why does adequacy of representation matter so much under Article 597?
Because it is the condition that makes the judgment binding on people who never appeared individually. The certification requirements and court oversight built into the earlier articles in this Chapter exist to make that adequacy a reality, not just an assumption.
Source & verification. Article text is reproduced verbatim from
the vLex (Louisiana Code of Civil Procedure, 2026 Edition). Enacted by the Louisiana Legislature.
Last verified July 30, 2026.
· Official source
Also known as: class action judgment binding effect louisianares judicata class action louisianala c.c.p. art. 597adequate representation class judgment