The preparation of this volume began with a conference held at Trier University, approximately thirty years after the publication of the first Belief in a Just World (BJW) manuscript. The location of the conference was especially appropriate given the continued interest that the Trier faculty and students had for BJW research and theory. As several chapters in this volume document, their research together with the other contributors to this volume have added to the current sophistication and status of the BJW construct. In the 1960s and 1970s Melvin Lerner, together with his students and colleagues, developed his justice motive theory. The theory of Belief in a Just World (BJW) was part of that effort. BJW theory, meanwhile in its thirties, has become very influential in social and behavioral sciences. As with every widely applied concept and theory there is a natural developmental history that involves transformations, differentiation of facets, and efforts to identify further theoretical relationships. And, of course, that growth process will not end unless the theory ceases to develop. In this volume this growth is reconstructed along Furnham's stage model for the development of scientific concepts. The main part of the book is devoted to current trends in theory and research.