By Cansu Koça
This article discusses the contemporary challenges of diffuse interest class actions. The primary issue is the limited access to justice for members of the diffuse class, exacerbated by the res judicata principle and inadequate due protection mechanisms. Therefore, the intricate process of certifying a diffuse class and ensuring adequate representation will be addressed. Concerns regarding the inability of various notice methods to reach all members of the diffuse class will also be highlighted, further underscoring the need for comprehensive reform. Drawing insights from innovative approaches in countries like Brazil and Argentina, this article proposes a nuanced res judicata framework in the U.S. that addresses adequacy concerns and upholds the principle of due process, while navigating the complexities of diffuse interest class actions.