Legal reasoning is an engaging field for cognitive science, since it raises so many fundamental questions, such as the representation and evolution of complex concepts. This article focuses on aspects of legal reasoning that require reasoning with cases, often in concert with other modes of reasoning.

Demystifying Legal Reasoning defends the proposition that there are no special forms of reasoning peculiar to law. Legal decision makers engage in the same modes of reasoning that all actors use in deciding what to do: open-ended moral reasoning, empirical reasoning, and deduction from authoritative rules. This book addresses common law reasoning when prior judicial decisions determine the law, and interpretation of texts. In both areas, the popular view that legal decision (...) makers practise special forms of reasoning is false. (shrink)

Automated legal reasoning and its application in smart contracts and automated decisions are increasingly attracting interest. In this context, ethical and legal concerns make it necessary for automated reasoners to justify in human-understandable terms the advice given. Logic Programming, specially Answer Set Programming, has a rich semantics and has been used to very concisely express complex knowledge. However, modelling discretionality to act and other vague concepts such as ambiguity cannot be expressed in top-down execution models based on (...) Prolog, and in bottom-up execution models based on ASP the justifications are incomplete and/or not scalable. We propose to use s(CASP), a top-down execution model for predicate ASP, to model vague concepts following a set of patterns. We have implemented a framework, called s(LAW), to model, reason, and justify the applicable legislation and validate it by translating (and benchmarking) a representative use case, the criteria for the admission of students in the “Comunidad de Madrid”. (shrink)

This is a reply to Alex Guerrero’s, Erin Kelly’s and Gabe Mendlow’s commentaries on Gideon Yaffe’s The Age of Culpability: Children and the Nature of Criminal Responsibility. The reply focuses on their objections concerning the nature of legal reasons, desert, and the political arrangements that make a difference to criminal culpability.

The purpose of this essay is to defend a claim that a certain consideration, which I call unworkability, is universally and necessarily relevant to legal reasoning. By that I mean that it is a consideration that must carry legal weight in the justification of some judicial decisions in every legal system in which (1) all disputed matters of law can be adjudicated, and (2) all judicial decisions are to be legally justified. Unworkability's necessary relevance has important (...) implications for a theory of relevance presented by Rolf Sartorius. On this theory, nearly all considerations that are relevant to a judicial decision are supplied by legal principles embedded in the legal rules and decisions, or by extralegal principles dependent, in some way, on the legal principles. (The exceptions to the embedding thesis that Sartorius would, no doubt, recognize are elaborated in the text but can be set aside here.) But there are possible legal systems which do not contain an embedded legal principle concerning unworkability; and nonetheless, unworkability is relevant to judicial reasoning in those systems. Hence, a theory of relevance that relies on principles embedded in the content of rules is too simplistic. Some substantive considerations are relevant for other reasons. (shrink)

Presidential pardon has always existed in criminal law and continues to constitute a very important competence of the head of state in many modern day countries. In the past, the clemency given by the sovereign represented an act which showed his/her mercy upon their subjects. It was often used as a tool to show the arbitrary will of the sovereign that constituted the law, rather than the law itself. Therefore, the classical school of criminal law that appeared in the 18th (...) century and emphasized the importance of the principle of legality, opposed harshly every kind of arbitrary deciding that excluded the law at the interest of the sovereign. This school is among the only interpretations of criminal law that engages for a complete abandonment of institutes such as pardon or amnesty. The revolutionary French Penal Code of 1791, which was strongly influenced by the classical school, excluded clemency for the proved wrongs that were severely punished. However, due to imperfections of the criminal justice system, amnesty and pardon or clemency, continue to exist and to be used in modern day criminal law. They are no longer considered acts of arbitrary decisions of the sovereign, instead they should represent important instruments of criminal law, used rarely and wisely with specifically designed goals that aim to bring justice rather than deny it. However, there are many cases when these institutes have been inappropriately used in a very arrogant way which shows that the ancient regime is not yet over for some countries in which the highest institutions continue to act as old and middle age despots. This article will analyze the legal reasoning of the institution of presidential pardon. It will try to establish why the classical school was so strictly opposed to this institute making use of the studies and interpretations found in the writings of Cesare Beccaria. It will explain the philosophy of modern day institutions of amnesty and pardon and the way in which they are regulated in the legal theory and practice. The article will explain the recent developments in Macedonia in regard to the use of presidential pardon. The methods to be used consist of desk research, historical and comparative methods and analysis of legal texts, laws and judicial decisions. (shrink)

This paper attempts to shed light on the dynamics of criminal adjudication. It starts by exploring some significant—and often ignored—similarities and dissimilarities between the practices and disciplines of, respectively, legal reasoning and fact finding. It then discusses the problem of defining the nature of these processes—legal reasoning, in particular—in terms of their being instances of practical or theoretical reasoning. Thus understood, the problem is shown to be distinct from two traditional questions of jurisprudence, namely whether (...) law consists of facts and, if so, whether these facts are social or moral. Two theses are proposed as solutions to the problem: 'in the majority of cases legal reasoning is theoretical', and 'when legal reasoning is practical it generally involves complex theoretical operations'. Finally, the paper shows how T1 and T2 can make sense of the phenomena presented at the outset. (shrink)

This paper suggests a way of thinking about the legal reasoning done by conscientious judges working in a legal system during periods when those judges believed that their Supreme Court was malfunctioning. Seeing a legal system as a shared cooperative activity allows us to best understand how legal decision-making can remain consistent when it contains elements at the highest level which are believed not to be functioning properly.

The first part of this work analyses the universalist and the particularist conceptions of reasons. The second part projects this analysis to the legal domain. The author stresses that universalism and particularism regarding reasons are mutually exclusive theories linked to incompatible conceptions of norms, i.e. norms as strict universal conditionals and norms as defeasible conditionals. In giving an account of this tenet, different meanings of universality and defeasibility are explored. A parallel debate regarding reasons can be found in the (...) legal domain, where two contrasting categories of norms are usually distinguished: rules and principles. On this issue the author argues that the conception of legal reasons depends on the way in which this contrast between different kinds of legal norms is shaped. (shrink)

The first part of this article contains an analysis of the concept of a right, which implies a rational structure of reasoning about rights, elaborated in the second part. In the third part both the concept of a right and reasoning about rights are connected with the theory of rational discourse. The author's thesis is that there exists an internal relation between the theory of rights and the theory of legal reasoning.

Wigmore thought that there was a science of proof underlying legal reasoning that could be displayed in any given case as a graphic sequence of argumentation from the evidence in the case leading to the ultimate probandum. Argumentation technology has now vindicated this approach by providing useful qualitative methods that can be applied to identifying, analyzing, and evaluating the pro and con arguments put forward by both sides in a trial. In this chapter, it is shown how to (...) apply argumentation schemes, such as argument from witness testimony, using argument diagrams applied to typical sequences of evidence-based legal reasoning in which there is a successive refinement of arguments displayed as the evidence comes into a case. It is shown how argument from applying rules to cases, teleological, argument from expert witness testimony, and abductive reasoning are centrally important for this purpose. (shrink)

This article deals with the relation between a theory of law and a theory of legal reasoning. Starting from a close reading of Chapter VII of H. L. A. Hart's The Concept of Law, it claims that a theory of law like Hart's requires a particular theory of legal reasoning, or at least a theory of legal reasoning with some particular characteristics. It then goes on to say that any theory of legal (...) class='Hi'>reasoning that satisfies those requirements is highly implausible, and tries to show that this is the reason why not only Hart, but also writers like Neil MacCormick and Joseph Raz have failed to offer a theory of legal reasoning that is compatible with legal positivism as a theory of law. They have faced a choice between an explanation of legal reasoning that is incompatible with the core of legal positivism or else strangely sceptical, insofar as it severs the link between general rules and particular decisions that purport to apply them. (shrink)

Referring to foreign legal systems for the sake of producing a convincing judicial argument has been a custom in judicial decision-making for more than a century. However, a generally accepted theoretical framework for this kind of reasoning is yet to be established. The article suggests that such a framework must answer at least the following three fundamental questions: first, what is the normative relationship, as a matter of principle, between domestic and foreign law?; second, what is the primary (...) motive and functioning of comparative legal reasoning?; and third, what methodological approach enables such reasoning to work in practice? Drawing in particular on linguistic philosophy, as well as recent work on the theory of argumentation, the article outlines a theoretical framework that addresses these questions in order to understand, evaluate and rationalise the use of comparative arguments in legal practice. (shrink)

The First World Congress on Evidential Legal Reasoning, organised by the Legal Culture Chair of the University of Girona, was held between June 6 and 8, 2018. The Congress was attended by 350 participants and featured 18 speakers from four continents. The three days of formal and informal presentations and discussions yielded excellent results, strengthening the interrelation between the legal communities and specialists of different traditions. The 18 papers from the Congress, reviewed by their authors based (...) on the discussions and the suggestions made at the Congress, have been compiled in this book. (shrink)

This essay develops an ideal of public legal reason--a normative theory of legal reasons that is appropriate for a society characterized by religious and moral pluralism. One of the implications of this theory is that normative theorizing about public and private law should eschew reliance on the deep premises of deontology or consequentialism and should instead rely on what the author calls public values--values that can be affirmed without relying on the deep and controversial premises of particular comprehensive (...) moral doctrines. The ideal of public legal reason is then applied to a particular question--whether welfarism (a particular form of normative law and economics) provides the sort of reasons that appropriate for legal practice. The answer to that question is no--to the extent that welfarism contends that the normative assessment of legal policies should rely exclusively on information about individual preferences, welfarism relies on deep and controversial premises of consequentialist moral theory that fail the test of public reason. The essay also investigates the thesis--advanced by Louis Kaplow and Steven Shavell--that any fairness principle (a nonwelfarist method of policy assessment) can violate weak Pareto (making everyone worse off). Whatever the implications of Kaplow and Shavell's argument, it does not show that welfarism can provide public legal reasons. The essay concludes that law's justifications should rely on normative principles that are accessible to reasonable citizens, whether they are theists or atheists, deontologists or consequentialists, moral philosophers or economists. Law's deliberations should be shallow and not deep. Law's reason should be public. (shrink)

This paper describes a model of legal reasoning and a logic for reasoning with rules, principles and goals that is especially suited to this model of legal reasoning. The paper consists of three parts. The first part describes a model of legal reasoning based on a two-layered view of the law. The first layer consists of principles and goals that express fundamental ideas of a legal system. The second layer contains legal (...) rules which in a sense summarise the outcome of the interaction of the principles and goals for a number of case types. Both principles, goals and rules can be used in legal arguments, but their logical roles are different. One characteristic of the model of legal reasoning described in the first part of the paper is that it takes these logical differences into account. Another characteristic is that it pays serious attention to the phenomena of reasoning about the validity and acceptance of rules, respectively principles and goals, and about the application of legal rules, and the implications of these arguments for the use of rules, principles and goals in deriving legal conclusions for concrete cases.The second part of the paper first describes a logic (Reason-Based Logic) that is especially suited to deal with legal arguments as described in terms of the previously discussed model. The facilities of the logic are illustrated by means of examples that correspond to the several aspects of the model. (shrink)

Legal Reason describes and explains the process of analogical reasoning, which is the distinctive feature of legal argument. It challenges the prevailing view, urged by Edward Levi, Cass Sunstein, Richard Posner and others, which regards analogical reasoning as logically flawed or as a defective form of deductive reasoning. It shows that analogical reasoning in the law is the same as the reasoning used by all of us routinely in everyday life and that it (...) is a valid form of reasoning derived from the innate human capacity to recognize the general in the particular, on which thought itself depends. The use of analogical reasoning is dictated by the nature of law, which requires the application of rules to particular facts. Written for scholars as well as students and persons generally who are interested in law, Legal Reason is written in clear, accessible prose, with many examples drawn from the law and from everyday experience. (shrink)

I discuss some of the roles that lay people play in relation to the criminal law, and how that law should figure in their practical reasoning: this will also cast light on the place of criminal law in a democratic republic. The two roles discussed in this paper are those of citizen, and juror. Citizens should be able to respect the law as their law – as a common law; but this must be a critical respect, captured in the (...) idea of ‘law abidance’ as a civic virtue. Jurors are tasked with making normative judgments of guilt or innocence, as part of a process through which those accused of criminal wrongdoing are called to answer to their fellow citizens: they must therefore be able to understand the law, and make it their own – which raises the question of whether jury nullification can be an appropriate response to unjust laws. (shrink)

Reasoning with cases has been a primary focus of those working in AI and law who have attempted to model legal reasoning. In this paper we put forward a formal model of reasoning with cases which captures many of the insights from that previous work. We begin by stating our view of reasoning with cases as a process of constructing, evaluating and applying a theory. Central to our model is a view of the relationship between (...) cases, rules based on cases, and the social values which justify those rules. Having given our view of these relationships, we present our formal model of them, and explain how theories can be constructed, compared and evaluated. We then show how previous work can be described in terms of our model, and discuss extensions to the basic model to accommodate particular features of previous work. We conclude by identifying some directions for future work. (shrink)

Legal reasoning is not the same as the reasoning in mathematics or the physical sciences. It is like them. Specifying the likeness in more detail, and deciding whether there is more likeness than unlikeness, are the kinds of tasks that legal reasoning is better adapted to do than mathematical or scientific reasoning.

This book offers a transnational perspective of evidentiary problems, drawing on insights from different systems and legal traditions. It avoids the isolated manner of analyzing evidence and proof within each Common Law and Civil Law tradition. Instead, it features contributions from leading authors in the evidentiary field from a variety of jurisdictions and offers an overview of essential topics that are of both theoretical and practical interest. The collection examines evidence not only as a transnational field, but in a (...) cross-disciplinary context. Each chapter engages with the interdisciplinary themes cutting through the issues discussed, benefiting from the expertise and experience of their diverse authors. (shrink)

The most glamorous and even glorious moments in a legal system come when a high court recognizes an abstract principle involving, for example, human liberty or equality. Indeed, Americans, and not a few non-Americans, have been greatly stirred--and divided--by the opinions of the Supreme Court, especially in the area of race relations, where the Court has tried to revolutionize American society. But these stirring decisions are aberrations, says Cass R. Sunstein, and perhaps thankfully so. In Legal Reasoning (...) and Political Conflict, Sunstein, one of America's best known commentators on our legal system, offers a bold, new thesis about how the law should work in America, arguing that the courts best enable people to live together, despite their diversity, by resolving particular cases without taking sides in broader, more abstract conflicts. Sunstein offers a close analysis of the way the law can mediate disputes in a diverse society, examining how the law works in practical terms, and showing that, to arrive at workable, practical solutions, judges must avoid broad, abstract reasoning. Why? For one thing, critics and adversaries who would never agree on fundamental ideals are often willing to accept the concrete details of a particular decision. Likewise, a plea bargain for someone caught exceeding the speed limit need not--indeed, must not--delve into sweeping issues of government regulation and personal liberty. Thus judges purposely limit the scope of their decisions to avoid reopening large-scale controversies. Sunstein calls such actions incompletely theorized agreements. In identifying them as the core feature of legal reasoning--and as a central part of constitutional thinking in America, South Africa, and Eastern Europe-- he takes issue with advocates of comprehensive theories and systemization, from Robert Bork to Jeremy Bentham, the father of utilitarianism, and Ronald Dworkin, who defends an ambitious role for courts in the elaboration of rights. Equally important, Sunstein goes on to argue that it is the living practice of the nation's citizens that truly makes law. For example, he cites Griswold v. Connecticut, a groundbreaking case in which the Supreme Court struck down Connecticut's restrictions on the use of contraceptives by married couples--a law that was no longer enforced by prosecutors. In overturning the legislation, the Court invoked the abstract right of privacy; the author asserts that the justices should have appealed to the narrower principle that citizens need not comply with laws that lack real enforcement. By avoiding large-scale issues and values, such a decision could have led to a different outcome in Bowers v. Hardwick, the decision that upheld Georgia's rarely prosecuted ban on sodomy. And by pointing to the need for flexibility over time and circumstances, Sunstein offers a novel understanding of the old ideal of the rule of law. Legal reasoning can seem impenetrable, mysterious, baroque. This book helps dissolve the mystery. Whether discussing the interpretation of the Constitution or the spell cast by the revolutionary Warren Court, Cass Sunstein writes with grace and power, offering a striking and original vision of the role of the law in a diverse society. In his flexible, practical approach to legal reasoning, he moves the debate over fundamental values and principles out of the courts and back to its rightful place in a democratic state: the legislatures elected by the people. (shrink)

In this paper, I consider and question an influential position in Anglo-American philosophy of action which suggests that reasons for action must be internal, in other words that statements about reasons for actions must make reference to some fact or set of facts about the agent and her desires. I do so by asking whether legal requirements could be considered as reasons for actions and if in so considering them one must translate statements about legal requirements into statements (...) about the psychological state of the agent fulfilling those requirements. Since such a process of translation seems neither necessary nor desirable, I suggest that the crudest forms of the internalist position are found wanting. I discuss a more sophisticated form of internalism put forward by Bernard Williams and criticised by John McDowell. I extend McDowells argument to cover legal reasons and suggest that Williams argument fails to recognise that reasons for action entail standards of correctness that are irreducible to facts about individual character and motivation. I conclude with a brief description of the justificatory status of legal requirements. (shrink)

Judges and jurors must make decisions in an environment of ignoranceand uncertainty for example by hearing statements of possibly unreliable ordishonest witnesses, assessing possibly doubtful or irrelevantevidence, and enduring attempts by the opponents to manipulate thejudge''s and the jurors'' perceptions and feelings. Three importantaspects of decision making in this environment are the quantificationof sufficient proof, the weighing of pieces of evidence, and therelevancy of evidence. This paper proposes a mathematical frameworkfor dealing with the two first aspects, namely the quantification ofproof (...) and weighing of evidence. Our approach is based on subjectivelogic, which is an extension of standard logic and probability theory,in which the notion of probability is extended by including degrees ofuncertainty. Subjective Logic is a framework for modelling humanreasoning and we show how it can be applied to legalreasoning. (shrink)

The articles in this volume consider at what stage of legal reasoning should a judge or lawyer make specifically moral judgments.

In Chapters 2, 3 and 7 of his new book, Law as a Leap of Faith, John Gardner provides the elements of an account of legal reasoning. It is on the basis of this account that Gardner defends or supports some of the most important theses of his book, viz. theses pertaining to how law can be made, to the relation between law and morality, and to the legitimacy of judicial law-making. A central element of Gardner’s account is (...) a distinction (suggested originally by Joseph Raz) between two forms of legal reasoning, namely, reasoning about the law and reasoning according to law. In this paper I intend to describe and evaluate Gardner’s account. Among the critical remarks that will appear in the paper is the claim that Gardner’s concept of reasoning according to law is overly inclusive. (shrink)

This course book serves an undergraduate course in introduction to legal reasoning. It is designed to initiate students in the legal methods of case law analysis and statutory interpretation, prompting students to take a critical distance from the wielding of the methods. It helps students acquire or refine the techniques of close reading, analogizing, distinguishing, positing related fact patterns, and criticizing judicial and legislative exposition and logic.

We present a computational model of dialectical argumentation that could serve as a basis for legal reasoning. The legal domain is an instance of a domain in which knowledge is incomplete, uncertain, and inconsistent. Argumentation is well suited for reasoning in such weak theory domains. We model argument both as information structure, i.e., argument units connecting claims with supporting data, and as dialectical process, i.e., an alternating series of moves by opposing sides. Our model includes burden (...) of proof as a key element, indicating what level of support must be achieved by one side to win the argument. Burden of proof acts as move filter, turntaking mechanism, and termination criterion, eventually determining the winner of an argument. Our model has been implemented in a computer program. We demonstrate the model by considering program output for two examples previously discussed in the artificial intelligence and legal reasoning literature. (shrink)

This handbook offers a deep analysis of the main forms of legal reasoning and argumentation from both a logical-philosophical and legal perspective. These forms are covered in an exhaustive and critical fashion, and the handbook accordingly divides in three parts: the first one introduces and discusses the basic concepts of practical reasoning. The second one discusses the main general forms of reasoning and argumentation relevant for legal discourse. The third one looks at their application (...) in law as well as at the different areas of legal reasoning. The handbook’s division in three parts reflects its conceptual architecture, since legal reasoning and argumentation are considered in relation to the more general types of reasoning. (shrink)

What makes an argument in a law case good or bad? This book examines this and other questions central to the study of jurisprudence. Care has been taken to make the legal elements of the book readily accessible to non-lawyers, and the philosophical elements to non-philosophers.

These critiques and the ways of thinking made possible in their wake tend to be called post-modern, a term which is vague and even a little irritating. It would be more precise and descriptive to speak instead of post- Enlightenment critiques of reason. Hume is arguably the first post-Enlightenment thinker, and after Hume these critiques of reason developed further in Hegel, Marx, Kierkegaard, and Nietzsche, and were then taken up by many lesser, 20th century thinkers. If the Enlightenment was the (...) age in which human reason in the form of argument and evidence superseded authority in the form of church and state, in the grounding of scientific, philosophical, moral, and political claims, then the critiques of reason I want to talk about are all post-Enlightenment. (shrink)

The covenant -- Signs and precedents -- The Sunna of God -- Rules, commands, and reasons why -- Legal arguments -- Comparison -- Contrast -- Categorical arguments -- Conditional and disjunctive arguments -- Technical terms and debating technique -- Conclusions.

This chapter contains section titled: The Demands of Political Legitimacy The Received View Persons Courts and Persons References Further Reading.

The challenge of calling "balls and strikes": the curious case of Gould v. Roberts -- To flatlaw and beyond : appreciating multiple analytic dimensions -- The traditions of legal reasoning : developing analytical legitimacy despite substantive disagreement -- Rethinking the analytic tradition : text, context, hypertext, and subtext -- The challenge of text : the relationship of "is," "ought," and focal meaning -- The challenge of context : what "is" means in both facts and law -- The challenge (...) of hypertext : the struggle within "ought" of multiple perspectives on fundamental values -- The challenge of subtext : considering the judiciary's role in the "game" of legal life -- The right (or rights?) to privacy (or privacies?) -- The never-ending disagreements over statutory interpretation : the primacy of subtext. (shrink)

The purpose of this essay is to defend a claim that a certain consideration, which I call unworkability, is universally and necessarily relevant to legal reasoning. By that I mean that it is a consideration that must carry legal weight in the justification of some judicial decisions in every legal system in which (1) all disputed matters of law can be adjudicated, and (2) all judicial decisions are to be legally justified. Unworkability's necessary relevance has important (...) implications for a theory of relevance presented by Rolf Sartorius. On this theory, nearly all considerations that are relevant to a judicial decision are supplied by legal principles embedded in the legal rules and decisions, or by extralegal principles dependent, in some way, on the legal principles. (The exceptions to the embedding thesis that Sartorius would, no doubt, recognize are elaborated in the text but can be set aside here.) But there are possible legal systems which do not contain an embedded legal principle concerning unworkability; and nonetheless, unworkability is relevant to judicial reasoning in those systems. Hence, a theory of relevance that relies on principles embedded in the content of rules is too simplistic. Some substantive considerations are relevant for other reasons. (shrink)

Analogy making from examples is a central task in intelligent system behavior. A lot of real world problems involve analogy making and generalization. Research investigates these questions by building computer models of human thinking concepts. These concepts can be divided into high level approaches as used in cognitive science and low level models as used in neural networks. Applications range over the spectrum of recognition, categorization and analogy reasoning. A major part of legal reasoning could be formally (...) interpreted as an analogy making process. Because it is not the same as reasoning in mathematics or the physical sciences, it is necessary to use a method, which incorporates first the ability to specify likelihood and second the opportunity of including known court decisions. We use for modelling the analogy making process in legal reasoning neural networks and fuzzy systems. In the first part of the paper a neural network is described to identify precedents of immaterial damages. The second application presents a fuzzy system for determining the required waiting period after traffic accidents. Both examples demonstrate how to model reasoning in legal applications analogous to recent decisions: first, by learning a system with court decisions, and second, by analyzing, modelling and testing the decision making with a fuzzy system. (shrink)

There are two possible ways to understand form and substance in legal reasoning. The first refers to the distinction between concepts and their applications, whereas the second concentrates on the difference between authoritative and non-authoritative reasons. These approaches refer to the formalistic and positivistic conceptions of the law, the latter being the author's point of departure. Nevertheless, they are both helpful means of analysis in legal interpretation. Interpretation is divided into formal and substantive justification. They have certain (...) functions and they are utilized in interaction. Authoritative reasons and formal reasoning constitute the necessary point of departure. However, substantive reasons are also necessary in order to justify choices included in interpretation. In addition to formal and substantive reasoning, the role of legal concepts is analysed. (shrink)

What role does and should religion play in the legal sphere of a modern liberal democracy? Does religion threaten to create divisions that would undermine the stability of the constitutional order? Or is religious disagreement itself a force that works to create consensus on some of the core commitments of constitutionalism--liberty of conscience, toleration, limited government, and the rule of law? This essay explores these questions from the perspectives of contemporary political philosophy and constitutional theory. The thesis of the (...) essay is that pluralism--the diversity of religious and secular conceptions of the good--can and should work as a force for constitutional consensus and that such a consensus is best realized through commitment to an ideal of public legal reason instantiated by the practice of legal formalism. The case for these claims is made in six parts. After the introduction, Part II, The Fact of Pluralism in the Context of Contemporary Religious Division, explores the idea of religious division in light of an important notion in political philosophy--the idea that John Rawls calls the fact of reasonable pluralism. Part III, Public Legal Reason, argues that the fact of pluralism has important normative consequences for the foundations of normative legal theory and argues for an ideal of public legal reason. Part IV, Legal Formalism, contends that this idea is best realized in constitutional practice through a formalist approach to constitutional interpretation--one that deliberately eschews direct reliance on religious and secular comprehensive conceptions of the good. Part V, Feasibility and Positive Theory, discusses the question whether this ideal of public legal reason and corresponding conception of constitutional formalism are realistic, given the constraints imposed by democratic politics under contemporary conditions. Finally, Part VI, Religious Division Revisited: From Pluralism to Formalism, brings the discussion to a close. (shrink)