Theories of explanation in the social sciences vacillate between holism and individualism. Wettersten contends that this has been a consequence of theories of rationality which assume that rationality requires coherent theories to be shown to be true. Rejecting these traditional assumptions about rationality Wettersten claims that the traditional explanations of rationality have placed unrealistic demands on both individuals and institutions. Analysing the theories of Weber and Popper, Wettersten shows that Popper made considerable progress in the theory of rationality, but ultimately stayed...