This chapter focuses at the more specific matter of whether there is reason to be theoretically rational. It argues that there is very strong reason to be theoretically rational. Unfortunately, answering the question about theoretical rationality does not settle questions about the normativity of practical rationality, but the chapter outlines in a speculative way how the considerations raised in favor of the normativity of theoretical rationality might be used to show that the requirements of practical rationality are normative. The use of wide-scope oughts, or perhaps wide-scope reasons, in giving an account of rational requirements is important for any view that holds that rational requirements are normative. The initial error is in thinking that rational requirements are conceptually identical to normative requirements. The truth of the particular normative requirement is, like any other ought, determined by the various features of the world on which normativity is dependent.