Benjamin Kiesewetter defends the normativity of rationality by presenting a new solution to the problems that arise from the common assumption that we ought to be rational. Drawing on an extensive and careful assessment of the problems discussed in the literature, Kiesewetter provides a detailed defence of a reason-response conception of rationality, a novel, evidence-relative account of reasons, and an explanation of structural irrationality in terms of theseaccounts.

Sometimes our intentions and beliefs exhibit a structure that proves us to be irrational. The Normativity of Rationality is concerned with the question of whether we ought to avoid such irrationality. Benjamin Kiesewetter defends the normativity of rationality by presenting a new solution to the problems that arise from the common assumption that we ought to be rational. The argument touches upon many other topics in the theory of normativity, such as the form and the content of rational requirements, the preconditions of criticism, and the function of reasons in deliberation and advice. Drawing on an extensive and careful assessment of the problems discussed in the literature, Kiesewetter provides a detailed defence of a reason-response conception of rationality, a novel, evidence-relative account of reasons, and an explanation of structural irrationality in terms of these accounts.

This book presents an account of normative practical reasons and the way in which they contribute to the rationality of action. Rather than simply 'counting in favour of' actions, normative reasons play two logically distinct roles: requiring action and justifying action. The distinction between these two roles explains why some reasons do not seem relevant to the rational status of an action unless the agent cares about them, while other reasons retain all their force regardless of the agent's attitude. It also explains why the class of rationally permissible action is wide enough to contain not only all morally required action, but also much selfish and immoral action. The book will appeal to a range of readers interested in practical reason in particular, and moral theory more generally.

Rationality requires that we intend the means that we believe are necessary for achieving our ends. Instrumental Rationality explores the formulation and status of this requirement of means-ends coherence. In particular, it is concerned with understanding what means-ends coherence requires of us as believers and agents, and why. Means-ends coherence is a genuine requirement of rationality and cannot be explained away as a myth, confused with a disjunction of requirements to have, or not have, specific attitudes. Nor is means-ends coherence strongly normative, such that we always ought to be means-ends coherent. A promising strategy for assessing why this requirement should exist is to consider the constitutive aim of intention. Just as belief has a constitutive aim (truth) that can explain some of the theoretical requirements of consistency and coherence governing beliefs, intention has a constitutive aim (here called "controlled action") that can explain some of the requirements of consistency and coherence governing intentions. We can therefore better understand means-ends coherence by understanding the constitutive aims of both of the attitudes governed by the requirement, intention, and belief.

Ralph Wedgwood gives a general account of the concept of rationality. The Value of Rationality is designed as the first instalment of a trilogy - to be followed by accounts of the requirements of rationality that apply specifically to beliefs and choices. The central claim of the book is that rationality is a normative concept. This claim is defended against some recent objections. Normative concepts are to be explained in terms of values (not in terms of 'ought' or reasons). Rationality is itself a value: rational thinking is in a certain way better than irrational thinking. Specifically, rationality is an internalist concept: what it is rational for you to think now depends solely on what is now present in your mind. Nonetheless, rationality has an external goal - the goal of thinking correctly, or getting things right in one's thinking. The connection between thinking rationally and thinking correctly is probabilistic: if your thinking is irrational, that is in effect bad news about your thinking's degree of correctness. This account of rationality explains how we should set about giving a theory of what it is for beliefs and choices to be rational. Wedgwood thus unifies practical and theoretical rationality, and reveals the connections between formal accounts of rationality (such as those of formal epistemologists and decision theorists) and the more metaethics-inspired recent discussions of the normativity of rationality. He does so partly by drawing on recent work in the semantics of normative and modal terms (including deontic modals like 'ought').

Alan Millar examines our understanding of why people think and act as they do. His key theme is that normative considerations form an indispensable part of the explanatory framework in terms of which we seek to understand each other. Millar defends a conception according to which normativity is linked to reasons. On this basis he examines the structure of certain normative commitments incurred by having propositional attitudes. Controversially, he argues that ascriptions of beliefs and intentions in and of themselves attribute normative commitments and that this has implications for the psychology of believing and intending. Indeed, all propositional attitudes of the sort we ascribe to people have a normative dimension, since possessing the concepts that the attitudes implicate is of its very nature commitment-incurring. The ramifications of these views for our understanding of people is explored. Millar offers illuminating discussions of reasons for belief and reasons for action; the explanation of beliefs and actions in terms of the subject's reasons; the idea that simulation has a key role in understanding people; and the limits of explanation in terms of propositional attitudes. He compares and contrasts the commitments incurred by propositional attitudes with those incurred by participating in practices, arguing that the former should not be assimilated to the latter. Understanding People will be of great interest to most philosophers of mind, as well as to those working on practical and theoretical reasoning.

The Importance of Being Rational systematically defends a novel reasons-based account of rationality. The book's central thesis is that what it is for one to be rational is to correctly respond to the normative reasons one possesses. Errol Lord defends novel views about what it is to possess reasons and what it is to correctly respond to reasons. He shows that these views not only help to support the book's main thesis, they also help to resolve several important problems that are independent of rationality. The account of possession provides novel contributions to debates about what determines what we ought to do, and the account of correctly responding to reasons provides novel contributions to debates about causal theories of reacting for reasons. After defending views about possession and correctly responding, Lord shows that the account of rationality can solve two difficult problems about rationality. The first is the New Evil Demon problem. The book argues that the account has the resources to show that internal duplicates necessarily have the same rational status. The second problem concerns the deontic significance of rationality. Recently it has been doubted whether we ought to be rational. The ultimate conclusion of the book is that the requirements of rationality are the requirements that we ultimately ought to comply with. If this is right, then rationality is of fundamental importance to our deliberative lives.