 This method of developing chemical theory relies on a systematic refinement of theories, attempting to bring them closer to the truth. Philosophers of science have called this process Galilean idealization, because as in Galileo’s work, idealizations are introduced for reasons of tractability and are removed as soon as possible (McMullin 1985; Weisberg 2007b). But not all chemists have shared this focus on ever more accurate calculations. Reflecting on why he didn’t choose this path in his own career, theorist Roald Hoffmann wrote: