 In the same vein, continental philosophers like Theodor Adorno and Jürgen Habermas regarded Popper as a positivist because of his alleged devotion to a unified science.However, this was also part of the "Popper legend"; Popper had in fact been the foremost critic of this doctrine of the Vienna Circle, critiquing it, for instance, in his "Conjectures and Refutations".The key features of positivism as of the 1950s, as defined in the "received view", are