 At the University of Pittsburgh following his mandatory retirement from Princeton in 1973, he continued to publish significant articles, including studies of the nature of scientific rationality, “Scientific Rationality: Analytic vs. Pragmatic Perspectives” (1979), and “Turns in the Evolution of the Problem of Induction” (1981), and on the structure of scientific theories, including, most importantly, “Limits of a Deductive Construal of the Function of Scientific Theories” (1988a) as well as “Provisos: A Problem Concerning the Inferential Function of Scientific Theories” (1988b), further enhancing his reputation by his willingness to reconsider earlier positions. After his death in 1997, new collections of his papers appeared (Jeffrey 2000; Fetzer 2001), which complemented studies of his research (Rescher 1969; Esler et al. 1985; Kitcher &amp; Salmon 1989; Fetzer 2000b).