Abstract
According to the Rationality Doctrine, whether morality is normative depends on the existence of a link of an important kind between morality and rationality. The RD is intuitively appealing and has a historical pedigree. Versions have been endorsed by philosophers who otherwise disagree fundamentally. A version of it has been used in arguing against the chapter’s account of the normativity of morality on the basis that, allegedly, it fails to establish the right kind of link between morality and rationality. Yet there are different views about what kind of link is required. After addressing issues about the concepts of normativity and rationality, the chapter narrows attention to one account of the required link, the Basic Linkage Thesis. As the chapterr shows, there is reason to doubt the truth of the BLT, which means that, if we hold that morality is normative, we need to question the RD. The chapterr considers and criticizes arguments for the RD and then presents three arguments intended to show that the RD cannot reasonably be invoked in order to adjudicate among moral theories.