Joinder and class actions are crucial procedural mechanisms in civil litigation. They allow multiple parties or claims to be combined in a single lawsuit, promoting efficiency and consistency in resolving disputes. These tools are governed by specific rules in the Federal Rules of Civil Procedure. This unit explores various types of joinder, including compulsory and permissive joinder, interpleader, and intervention. It also delves into class actions, examining their requirements, certification process, and impact on plaintiffs, defendants, and the judicial system. Real-world examples illustrate the application and challenges of these procedures.