 The constructivist interpretation is meant to capture Kant’s distinctive insights about practical reason and the self-authenticating nature of reason as a self-legislative activity. The distinctive character of this conception resides in the idea that reason itself should be scrutinized by reason in order for its verdicts to be justified. Constructivists hold that practical reason itself is constructed in the sense that its legitimacy and authority are established by reasoning, rather than by appeal to some facts about the way the world is (O’Neill 1989b; Rawls 2000: 238; O’Neill 2015; Bagnoli 2013b).