Introduction

This introductory chapter presents the “Amicus Curiae Phenomenon,” the widespread global adoption of the amicus curiae (friend of the court) procedure in recent decades across common law, continental law, and international law jurisdictions. The author establishes criteria to identify and examine this phenomenon, including the rapid adoption of amicus curiae by various judicial systems, the increasing use and scope of amicus briefs, and their influence on court decisions. The chapter explores the main ideas behind this development, arguing that it is linked to changes in the judicial system’s role and the courts’ increasing involvement in shaping society. Courts need broader information and perspectives provided by amici, while interest groups see amicus briefs as a means to influence decisions affecting their well-being. The author outlines the research questions, comparative legal research methodology, and the three-part structure of the book, which will further analyze the causes, implications, and significance of the Amicus Curiae Phenomenon for modern law and society.