 The principal attempt to uncover the unity of Kantian reason and to relate it to contemporary philosophical concerns is due to Onora O’Neill (1989 and subsequent essays). This section will focus on her central claim concerning the unifying role of the Categorical Imperative, and the main bases for this claim in Kant’s texts. Although O’Neill’s interpretation of Kantian reason enjoys considerable respect among Kant scholars, it should be added that it has not yet attracted a significant critical literature. (Among early reviews, see Engstrom 1992 and Wood 1992; for recent endorsement and restatement, see Korsgaard 2008: 12 and Westphal  2011.)[22]