Julian Wuerth presents a positive interpretation of Kant’s strategy for arguing for the categorical imperative. Wuerth calls this strategy the "elimination of sensibility process," according to which Kant systematically eliminates the offerings of sensibility in order to isolate the teachings of pure reason. The chapter then applies the findings of this discussion to an assessment of Kantian constructivist strategies in ethics, especially the constructivism of Christine Korsgaard. Wuerth points to some problems with a number of constructivist systems, and then argues that Korsgaard’s constructivism, for all of its virtues, does not respect Kant’s distinction in kind between reason and sensibility and in the end falls short of both as an interpretation of Kant’s argument.