The problem of scientific rationality and Feyerabend's views on the subject need no special introduction in this context. What does need emphasis is the desirability of resisting the widespread tendency either to dismiss him as a Dadaist or to take his rhetoric seriously and despair about the rationality of science. Both tendencies betray a failure to appreciate his peculiar contributions, which are a (relatively) novel theory of rationality, and a (relatively) novel problem. The theory is that scientific rationality is essentially rhetorical, in the sense that scientific method ultimately reduces to a matter of techniques of persuasion (as distinct from, say, a matter of “method”); and the problem, which remains even for those who may reject the theory, is that of the role of rhetoric in science.

Since Feyerabend's latest book is full of the rhetoric of irrationalism, it is best to begin by purifying the air surrounding such rhetoric.