This book offers a detailed analysis of judicial activism in international adjudication using the WTO Appellate Body and the European Court of Justice as the comparative subjects. It will discuss the negative and positive aspects of judicial activism by incorporating sociological elements in its doctrinal approach. The objective of the book is not only to provide a scientific understanding of judicial activism in international adjudication but also the means of international courts and tribunals to engage in judicial activism and other considerations operating inside and outside the courtrooms.