 Hayek’s intellectual adversaries shifted in the second half of his career, though of course there are common themes. But the German Historicist and the Collectivist Positivist were no longer the animating force they were in the first half of the 20th century. Logical positivism was also transformed. One of the remnants from the influence of Scientism, however, was in Hayek’s mind a failure to address the essential complexity of the social world. As a consequence, his methodological writings in the 1960s and 1970s tend to stress not subjectivism and the human sciences, but the differences between the sciences of simple phenomena and the sciences of essential complexity.