Our human capacity for planning agency plays central roles in the cross-temporal organization of our agency, in our acting and thinking together, and in our self-governance. Intentions can be understood as states in such a planning system. The practical thinking essential to this planning capacity is guided by norms that enjoin synchronic plan consistency and coherence as well as forms of plan stability over time. This book’s essays aim to deepen our understanding of these norms and defend their status as norms of practical rationality for planning agents. General guidance by these planning norms has many pragmatic benefits, especially given our cognitive and epistemic limits. But appeal to these pragmatic benefits does not fully explain the normative force of these norms in application to the particular case. In response, some think these norms are norms of theoretical rationality on belief; or are constitutive of agency; or are just a myth. These essays chart an alternative path, which sees these planning norms as tracking conditions of a planning agent’s self-governance, both at a time and over time. This path articulates associated models of self-governance; it appeals to the agent’s end of her self-governance over time; and it argues that this end is rationally self-sustaining. This end is thereby in a position to play a role in our planning framework that is analogous to the role of a concern with quality of will within the framework of the reactive attitudes, as understood by Peter Strawson.