 Like Kant, Popper was interested in a transcendental and regulative philosophy, and, more so than Kant, he hailed science as the paradigm of intellectual activity. But by 1928 he was still holding a commitment to inductivism. In 1928 Popper finished his doctoral dissertation, ‘On the Methodological Problem of Cognitive Psychology’. There, Popper set out to understand the relations between logic, biology and psychology in the production of knowledge and, to that effect, to outline the methodological preconditions of cognitive psychology. Two alternative views of psychology were available to Popper through his two doctoral examiners, Karl Bühler and Moritz Schlick.