This text is a comprehensive treatise examining the challenges presented by complex litigation. Subjects covered include devices for aggregating large numbers of claims (including extended discussions of multidistrict litigation and class actions), techniques to narrow issues and efficiently gather evidence during pretrial, methods to conduct trials in mass disputes, and ways to provide remedies for widespread harm. Although the focus is on litigation, the book also explores the increasing use of alternative methods to resolve mass disputes. The book is theoretically sophisticated enough for use in academic research or legal practice, but written in a manner to be accessible to students. The book is designed to be compatible with all existing casebooks on complex litigation, but it can also serve as a stand-alone text for the classroom. Occasional problems and questions guide student understanding.