 Feyerabend (1962, 1966), Churchland (1986), Schaffner (1993), and Bickle (1998), amongst others, have argued that Nagel’s model allows neither for correction in the reducing theory nor for replacement, and that, therefore, it is fundamentally misguided. Recall, however, that Nagel suggests that at least some interesting reductions involve correction. He writes that: