Friedrich Hayek was a fervent advocate of the methodological specificity of the social sciences. However, given his contact with Karl Popper, several historians and philosophers have characterized his final position as Popperian, that is, a position that would have accepted the unity of scientific method. A closer look at Hayek's philosophy and Popper's own intellectual course shows that such a thesis is based on misconceptions that can be overcome by taking the Hayekian concept of 'spontaneous order' as the foundation of (...) a methodology immune to any kind of methodological monism. (shrink)