This paper is a excursus into a philosophy of science for deployment in the study of sport. It argues for the virtues of Thomas Kuhn's account of the philosophy of science, an argument conducted strategically by contrasting that account with one derived from views of Karl Popper. In particular, it stresses, first, that Kuhn's views have been widely misunderstood; second, that a rectified Kuhnianism can give due weight to truth in science, while recognising that social sciences differ in crucial ways (...) from natural sciences. For, as Kuhn recognised, social sciences do not function in the paradigm-relative way characteristic of natural sciences. Yet there Kuhn's jargon, and especially misguided talk of ?paradigms?, is almost ubiquitous. These thoughts have relevance for three groups. First, as both sports scientists and exercise scientists come to grips with the claims to scientificity of their work, they will need increasingly to locate it within an epistemological framework provided by philosophy of science. So they must begin to take Kuhn's view seriously. Second, social scientists of sport ? faced with the predominant scientism of colleagues in sport and exercise science ? must also recognise alternatives to a postmodernist rejection of the concept of truth, where Kuhn's picture of natural science clarifies one such. Finally, philosophers writing on sport must not let antipathy to scientism close off the options they present or the terms in which they (we!) present them. And that may require debate among ourselves on abstract issues not immediately connected with sport. (shrink)