While comparison has been the subject of much theoretical debate in the study of religion, it has rarely been discussed in methodological terms. A large number of comparative studies have been produced in the course of the discipline's history, but the question of how comparison works as a method has rarely been addressed. This essay proposes, in the form of an outline, a methodological frame of comparison that addresses both the general configuration of a comparative study-its goal, mode, scale, and scope-and the comparative process, distinguishing operations of selection, description, juxtaposition, redescription, as well as rectification and theory formation. It argues that identifying and analyzing such elements of a comparative methodology helps, on the one hand, in evaluating existing comparative studies and, on the other, in producing new ones. While the article attempts to present the methodological frame in a concise form and thus offers limited illustrative material, the authors of the other essays in this collection discuss rich historical-empirical cases as they test the frame on their own comparative studies.