We are here to assess the merits and current fortunes of one of the most controversial theses to emerge in the philosophy of science in the latter half of the twentieth century: the thesis of the incommensurability of scientific theories. The controversy about incommensurability dates to the year 1962, the year in which the thesis of incommensurability was first explicitly proposed by its two chief advocates, Paul Feyerabend and Thomas Kuhn.