The particularity of Dadrian's research is that by mastering many languages, including German, English, French, Turkish, Ottoman Turkish, and Armenian, he has researched archives of different countries, and extensively studied materials in various languages in a way that very few, if anyone has done before him. One of Dadrian's major researches is the volume titled "The History of the Armenian Genocide" which had seven printings and appeared in numerous languages. In this book Dadrian described the background, initiation and unfolding of the genocide, and placed it within a conceptual framework of genocide theory. Roger W. Smith praised it as a "rare work, over 20 years in the making, that is at once fascinating to read, comprehensive in scope, and unsurpassed in the documentation of the events it describes." According to William Schabas, the president of the International Association of Genocide Scholars, "Dadrian's historical research on the Armenian Genocide is informed by a rich grasp of the legal issues", and "his contribution both to historical and legal scholarship is enormous."