Between Rationalism and Relativism. On Larry Laudan's Model of Scientific Rationality

Abstract

In the early sixties there broke out a fierce controversy concerning rationality in science which was labelled as the Popper-Kuhn controversy. It can be conceived in terms of the rationalism-relativism opposition. This may seem dubious, for the proper contrast to rationalism is irrationalism, and the one to relativism is absolutism. What is at issue, however, is whether scientific change comes about in consequence of argument or in consequence of-to use Kuhn's favourite dictum-conversion. The notion of argument does not involve here anything absolute, while the one of conversion is intended to cover not merely the idea of irrationality of change, but the idea of selfauthentication and constitution as one among many possible patterns of rationality. Thus the main message is that of break of communication between otherwise rational agents and not of their apparent irrationality. These are my reasons for thinking this unusual opposition better than the usual ones pointing at the substance of the controversy. I think also this opposition has in fact been implicit in the resulting debate. This explains, for instance, why in the