A common question new students of Rule 23(b)(2) ask is why it exists at all. After all, if an injunction truly offers indivisible relief, why would one seek to bring it on behalf of a class? Wouldn’t the individual pursuing the injunction get relief for the class if she wins just by bringing the lawsuit

When faced with a complex factual issue, where it would be difficult to certify under Rule 23(b)(3) (because individual issues of causation or liability clearly predominate over common issues), plaintiffs will sometimes seek injunctive relief under Rule 23(b)(2) instead. From a rhetorical standpoint, seeking injunctive relief under Rule 23(b)(2) makes a powerful argument for certification