ABSTRACTThe partial opening up of the formerly closed Soviet archives has had an enormous impact on the amount of new historical material available for research. Recent developments in research on Stalin and the Soviet Union are remarkable. The present article examines these developments with respect to three particular topics: ‘Stalin and Terror’, ‘Stalin and ideology’, and ‘Stalin and society’. It argues that whereas in certain areas new information has led to a greater consensus among historians, in others, such as Stalin's Great Terror, it has led to heated controversy. The article asks why, and suggests that the problem lies both in conceptualization and in the use of historical sources. More generally, the article discusses the present state of knowledge in the field. Because the study of Stalinism is often assessed in the light of the study of Nazism, it includes brief comparisons of Stalin and Hitler and Stalinism and Nazism where appropriate.