On the oceasion of the 40th anniversary of the appearance of the book »Razvoj slovenskega narodnega vprašanja« (Development of the Slovene National Question), vvritten by Edvard Kardelj (pseudonym Sperans) the author deals vvith historiographical activity of the Slovene Marxists in the years 1932—1941 (Ivo Grahor, Dušan Kermavner, Boris Kidrič, Vladimir Martelanc, Jože Vilfan, Boris Ziherl and others). Kardelj's book presents culmination of this activity, which was actually a preparation for the national liberation vvar and revolution in Slovenia in the years 1941—1945. That activity was of great importance also because of its historiographical achievments.