 At Alpbach in 1964, Feyerabend and Feigl jointly directed a seminar on the recent development of analytic philosophy. There Feyerabend re-encountered the leading light of the Logical Positivist movement, Rudolph Carnap (whom he had already met at UCLA). Carnap tried to convince Feyerabend of the virtues of clarity, but failed. Feyerabend was still attached to “scientific” philosophy, and considered philosophy worthless unless it made a positive and quantifiable contribution to the growth of knowledge (which, of course, meant science).