  Finally, it should be noted that Weber’s commitment to methodological individualism is closely related to his more well-known methodological doctrine, viz., the theory of ideal types. Historical explanation may make reference to the actual content of the intentional states that motivated particular historical actors, but the sociologist is interested in producing much more abstract explanatory generalizations, and so cannot appeal to the specific motives of particular individuals. Thus sociological theory must be based upon a model of human action. And because of the constraints that interpretation imposes, this model must be a model of rational human action (Weber writes: “it is convenient to treat all irrational, affectually determined elements of behavior as factors of deviation from a conceptually pure type of rational action” [1922, 6].)