To understand the underpinnings of this field is to shed light on how much of the Western world has understood itself through the 20th century. The "International Dictionary of Psychoanalysis" -- published in France in 2002 and now available in English -- is the most extensive reference work published on this topic. Not only does it represent all branches of the field, but it also defines the evolution of the different theoretical and clinical psychoanalytical concepts as well as the major individuals, works, events and institutions that have impacted the history of the psychoanalytical movement. Additionally, it reveals the history of psychoanalysis in 50 countries and shows the relationship between psychoanalysis and other disciplines, with entries discussing writers, philosophers, literary movements and historical events. Articles include discussion of 900 concepts and notions, 360 biographies of the major psychoanalysts worldwide and 170 articles on their major works.