Economic activity is more globally integrated than ever before, but so is the scope of corporate misconduct. As more and more people across the world are affected by such malfeasance, the differences in legal redress have become increasingly visible. This transparency has resulted in a growing convergence towards an American model of robust private enforcement of the law, including the class-action lawsuit. This handbook brings together scholars from nearly two dozen countries to describe and assess the class-action procedure (or its equivalent) in their respective countries and, where possible, to offer empirical data on these systems. At the same time, the work presents a variety of multidisciplinary perspectives on class actions, from economics to philosophy, making this handbook an essential resource to academics, lawyers, and policymakers alike.