A model of coherentist belief contraction is constructed. The outcome of belief contraction is required to be one of the coherent subsets of the original belief set, and a set of plausible properties is proposed for this set of coherent subsets. The contraction operators obtained in this way are shown to coincide with well-known belief base operations. This connection between coherentist and "foundationalist" approaches to belief change has important implications for the philosophical interpretation of models of belief change.

The coherentist theory of justification provides a response to the sceptical challenge: even though the independent processes by which we gather information about the world may be of dubious quality, the internal coherence of the information provides the justification for our empirical beliefs. This central canon of the coherence theory of justification is tested within the framework of Bayesian networks, which is a theory of probabilistic reasoning in artificial intelligence. We interpret the independence of the information gathering processes (IGPs) in (...) terms of conditional independences, construct a minimal sufficient condition for a coherence ranking of information sets and assess whether the confidence boost that results from receiving information through independent IGPs is indeed a positive function of the coherence of the information set. There are multiple interpretations of what constitute IGPs of dubious quality. Do we know our IGPs to be no better than randomization processes? Or, do we know them to be better than randomization processes but not quite fully reliable, and if so, what is the nature of this lack of full reliability? Or, do we not know whether they are fully reliable or not? Within the latter interpretation, does learning something about the quality of some IGPs teach us anything about the quality of the other IGPs? The Bayesian-network models demonstrate that the success of the coherentist canon is contingent on what interpretation one endorses of the claim that our IGPs are of dubious quality. (shrink)

A model of coherentist belief contraction is constructed. The outcome of belief contraction is required to be one of the coherent subsets of the original belief set, and a set of plausible properties is proposed for this set of coherent subsets. The contraction operators obtained in this way are shown to coincide with well-known belief base operations. This connection between coherentist and foundationalist approaches to belief change has important implications for the philosophical interpretation of models of belief change.

In ‘A reductio of coherentism’ (Analysis 67, 2007) Tom Stoneham offers a novel argument against epistemological coherentism. ‘On the face of it’, he writes, ‘the argument gives a conclusive reductio ad absurdum of any coherence theory of justification. But that cannot be right, can it?’ (p. 254). It could be right, but it isn’t. I argue that coherentists need not accept the central premises of Stoneham’s argument and that, even if these premises were acceptable and true, Stoneham’s reductio (...) would not follow. (shrink)

Coherentists on epistemic justification claim that all justification is inferential, and that beliefs, when justified, get their justification together (not in isolation) as members of a coherent belief system. Some recent work in formal epistemology shows that “individual credibility” is needed for “witness agreement” to increase the probability of truth and generate a high probability of truth. It can seem that, from this result in formal epistemology, it follows that coherentist justification is not truth-conducive, that it is not the case (...) that, under the requisite conditions, coherentist justification increases the probability of truth and generates a high probability of truth. I argue that this does not follow. (shrink)

What makes an ``ought'''' claim authoritative? What makes aparticular norm genuinely reason-giving for an agent? This paper arguesthat normative authority can best be accounted for in terms of thejustification of norms. The main obstacle to such a theory, however, isa regress problem. The worry is that every attempt to offer ajustification for an ``ought'''' claim must appeal to another ``ought''''claim, ad infinitum. The paper argues that vicious regress canbe avoided in practical reasoning in the same way coherentists avoid theproblem in (...) epistemology. Norms are justified by their coherence withother norms. (shrink)

This paper defends a coherentist approach to moral epistemology. In “The Immorality of Eating Meat”, I offer a coherentist consistency argument to show that our own beliefs rationally commit us to the immorality of eating meat. Elsewhere, I use our own beliefs as premises to argue that we have positive duties to assist the poor and to argue that biomedical animal experimentation is wrong. The present paper explores whether this consistency-based coherentist approach of grounding particular moral judgments on beliefs we (...) already hold, with no appeal to moral theory, is a legitimate way of doing practical ethics. I argue that grounding particular moral judgments on our core moral convictions and other core nonmoral beliefs is a legitimate way to justify moral judgments, that these moral judgments possess as much epistemic justification and have as much claim to objectivity as moral judgments grounded on particular ethical theories, and that this internalistic coherentist method of grounding moral judgments is more likely to result in behavioral guidance than traditional theory-based approaches to practical ethics. By way of illustrating the approach, I briefly recapitulate my consistency-based argument for ethical vegetarianism. I then defend the coherentist approach implicit in the argument against a number of potentially fatal metatheoretical attacks. (shrink)

Semantic holists view what one's terms mean as function of all of one's usage. Holists will thus be coherentists about semantic justification: showing that one's usage of a term is semantically justified involves showing how it coheres with the rest of one's usage. Semantic atomists, by contrast, understand semantic justification in a foundationalist fashion. Saul Kripke has, on Wittgenstein's behalf, famously argued for a type of skepticism about meaning and semantic justification. However, Kripke's argument has bite only if one understands (...) semantic justification in foundationalist terms. Consequently, Kripke's arguments lead not to a type of skepticism about meaning, but rather to the conclusion that one should be a coherentist about semantic justification, and thus a holist about semantic facts. (shrink)

Coherentists attempt to solve the problem of infinite regress by rejecting what they sometimes call “the linear conception of knowledge.” Coherentists adopt, instead, a holistic conception of justification. This chapter examines BonJour's efforts to develop a coherentist account of empirical knowledge. BonJour faces two tasks: the first is to specify the conditions for a system of beliefs to be coherent, the second is to provide an argument showing that a system possessing these features provides justification for the beliefs it contains. (...) To be coherent, according to BonJour, a system must be both logically and probabilistically consistent, be rich in inferential connections, not be divided into isolated subsystems, and be free of anomalies. Finally, to be justified in believing something, a person must be able recognize that his belief has this status in his system of beliefs. This position is criticized on a number of grounds. It seems to have the consequence that no human being has ever been justified in any of his empirical beliefs. Nothing seems to rule out the multiple‐choice problem of there being two equally coherent but incompatible systems of belief. (shrink)

Coherentism is a theory of epistemic justification. It implies that for a belief to be justified it must belong to a coherent system of beliefs. For a system of beliefs to be coherent, the beliefs that make up that system must “cohere” with one another. Typically, this coherence is taken to involve three components: logical consistency, explanatory relations, and various inductive (non-explanatory) relations. Rival versions of coherentism spell out these relations in different ways. They also differ on the (...) exact role of coherence in justifying beliefs: in some versions, coherence is necessary and sufficient for justification, but in others it is only necessary. (shrink)

What does it mean for a hypothesis to be ad hoc? One prominent account has it that ad hoc hypotheses have no independent empirical support. Others have viewed ad hoc judgements as subjective. Here I critically review both of these views and defend my own Coherentist Conception of Ad hocness by working out its conceptual and descriptive attractions.

According to metaphysical coherentism, grounding relations form an interconnected system in which things ground each other and nothing is ungrounded. This potentially viable view’s logical territory remains largely unexplored. In this paper, I describe that territory by articulating four varieties of metaphysical coherentism. I do not argue for any variety in particular. Rather, I aim to show that not all issues which might be raised against coherentism will be equally problematic for all the versions of that view, (...) which features far more nuance and diversity than is typically ascribed to it. (shrink)

This article intervenes in the debate over the noetic structure of empirical beliefs required for epistemic justification, focusing on the choice between internalist foundationalism and coherentism. Analysing the link between noetic structure and the introspective accessibility of essential justifiers, I argue that coherentism has greater doxastic plausibility than foundationalism. To deepen my account, I constructively develop ideas from the late-period Edmund Husserl to propose a first-order epistemological theory that I term ‘Lifeworld Coherentism’. I argue that, especially through (...) the idea of the epistemic agent’s ‘doxic horizon’, this theory can overcome some of the worries surrounding the introspective awareness of belief coherence. Finally, in order to extend the second-order dimension of the debate, I introduce ‘Tradition-Based Perspectivalism’, a meta-epistemological theory that Erik Baldwin uses to address concerns about the social grounding of epistemic theorising. Though supportive of Baldwin’s reading of Alasdair MacIntyre on this point, I argue that Tradition-Based Perspectivalism is a better fit to Lifeworld Coherentism as a first-order theory than to his own preferred Proper Functionalism. (shrink)

Plantinga argues that cases involving ‘fixed’ beliefs refute the coherentist thesis that a belief’s belonging to a coherent set of beliefs suffices for its having justification (warrant). According to Plantinga, a belief cannot be justified if there is a ‘lack of fit’ between it and its subject’s experiences. I defend coherentism by showing that if Plantinga means to claim that any ‘lack of fit’ destroys justification, his argument is obviously false. If he means to claim that significant ‘lack of (...) fit’ destroys justification, his argument suffers a critical lack of support. Either way, Plantinga’s argument fails and coherentism emerges unscathed. (shrink)

Approximate coherentism suggests that imperfectly rational agents should hold approximately coherent credences. This norm is intended as a generalization of ordinary coherence. I argue that it may be unable to play this role by considering its application under learning experiences. While it is unclear how imperfect agents should revise their beliefs, I suggest a plausible route is through Bayesian updating. However, Bayesian updating can take an incoherent agent from relatively more coherent credences to relatively less coherent credences, depending on (...) the data observed. Thus, comparative rationality judgments among incoherent agents are unduly sensitive to luck. (shrink)

Over the last twenty years, John Rawls has developed an approach to political philosophy which appeals to the notion of reflective equilibrium. This notion has proven suggestive to those attracted to coherence approaches to justification, in ethics and in other domains as well. In this paper, I explore the question whether Rawls’s approach provides a model for a coherentist account of justification, concluding that although the discussion of reflective equilibrium has provided helpful insights it has not produced a coherentist model (...) of justification. (shrink)

Some critics of coherentism have depicted it so that it founders on the distinction between warrant for the content of a belief and warrant for the believing itself. This distinction has to do with the basing relation: one might have warrant for the content of what one believes without basing one's belief properly, without holding the belief because of what warrants it. When the first kind of warrant obtains, I will say that a belief is propositionally warranted.

In this paper I offer a coherentist justification of induction along the lines of a Sellarsian coherence theory. On this coherence theory, a proposition is justified if we can answer all objections raised against it in our social practice of demanding justification and responding to such demands. On the basis of this theory of justification, I argue that we are justified in accepting the uniformity of nature partly because we have no alternative but to accept it for rationally pursuing our (...) epistemic goal. In addition, my coherentist view explains which inductive inferences it is rational to accept. Furthermore, my coherentist view also explains why we can hardly determine a particular numerical value x such that we can draw the conclusion ‘it is rational to accept that p’ from the premise ‘the numerical probability of p is greater than or equal to x’. (shrink)

The most pressing difficulty coherentism faces is, I believe, the problem of justified inconsistent beliefs. In a nutshell, there are cases in which our beliefs appear to be both fully rational and justified, and yet the contents of the beliefs are inconsistent, often knowingly so. This fact contradicts the seemingly obvious idea that a minimal requirement for coherence is logical consistency. Here, I present a solution to one version of this problem.

Liberal societies are characterized by respect for a fundamental value pluralism; i.e., respect for individuals’ rights to live by their own conception of the good. Still, the state must make decisions that privilege some values at the cost of others. When public ethics committees give substantial ethical advice on policy related issues, it is therefore important that this advice is well justified. The use of explicit tools for ethical assessment can contribute to justifying advice. In this article, I will discuss (...) one approach to ethical assessment, the ethical matrix method. This method is a variant of intuitionist balancing. Intuitionism is characterized by stressing the existence of several (at least two) fundamental prima facie moral principles, between which there is no given rank order. For some intuitionist approaches, coherentism has been proposed as a model of justification. This article will discuss justification of ethical advice and evaluate the appropriateness of coherentism as a justificatory approach to intuitionist tools. (shrink)

The metaphilosophical tendency of philosophical idealism inclines towards a view of philosophy itself that locates the goal of this enterprise in the construction of a cogent and comprehensive account of the nature and grounding human mind's experience of its world. And the coherentism to which idealism in general inclines is operative here as well. However, such a view of philosophizing's mission soon constrains the project to confront the implications of the complexity of human experience-its immense diversity and variability. Conflicting (...) tendencies and tensions are present throughout. Any attempt at the rational systematization of experience is bound to come up against its inner stresses and strains that brings an aporetic complexity to the fore. Against the background of this general line of thought, I have argued in earlier publications for three interconnected theses regarding philosophical methodology. (shrink)

Can a perceptual experience justify (epistemically) a belief? More generally, can a nonbelief justify a belief? Coherentists answer in the negative: Only a belief can justify a belief. A perceptual experience can cause a belief but cannot justify a belief. Coherentists eschew all noninferential justification—justification independent of evidential support from beliefs—and, with it, the idea that justification has a foundation. Instead, justification is holistic in structure. Beliefs are justified together, not in isolation, as members of a coherent belief system. The (...) main question of the paper is whether coherentism is consistent. I set out an apparent inconsistency in coherentism and then give a resolution to that apparent inconsistency. (shrink)

Once upon a time, coherentism was the dominant response to the regress problem in epistemology, but in recent decades the view has fallen into disrepute: now almost everyone is a foundationalist (with a few infinitists sprinkled here and there). In this paper, I sketch a new way of thinking about coherentism, and show how it avoids many of the problems often thought fatal for the view, including the isolation objection, worries over circularity, and concerns that the concept of (...) coherence is too vague or metaphorical for serious theoretical use. The key to my approach is to take a familiar tool from discussions of the regress problem -- namely, directed graphs depicting the support relations between beliefs -- and to use that tool in a more sophisticated manner than it is standardly employed. (shrink)

In this paper I prove that holistic coherentism is logically equivalent to the conjunction of symmetry and quasi-transitivity of epistemic support and a condition on justified beliefs. On the way I defend Tom Stoneham from a criticism made by Darrell Rowbottom and prove a premiss of Stoneham’s argument to be an entailment of coherentism.

Recent results in probability theory have cast doubt on the coherence theory of justification, allegedly showing that coherence cannot produce justification for beliefs in the absence of foundational justification, and that there can be no measure of coherence on which coherence is generally truth-conducive. I argue that the coherentist can reject some of the assumptions on which these theorems depend. Coherence can then be held to produce justification on its own, and truth-conducive measures of coherence can be constructed.

The problem of epistemic circularity involved in justifying fundamental epistemic principles is one of the fundamental problems of epistemology. One important way out of this problem is a Sellarsian social practice theory of justification, according to which we are justified in accepting an epistemic principle if we can answer all objections raised against it in our social practice of demanding justification and responding to such demands. The main goal of this paper is to show that this social practice theory can (...) accomplish better than its rival theories, such as Alston’s doxastic practice approach, Sosa’s reliabilist virtue epistemology, and Wright’s entitlement theory, by making comparisons with these influential theories. (shrink)

If a subject’s belief system is inconsistent, does it follow that the subject’s beliefs (all of them) are unjustified? It seems not. But, coherentist theories of justification (at least some of them) imply otherwise, and so, it seems, are open to counterexample. This is the “Problem of Justified Inconsistent Beliefs”. I examine two main versions of the Problem of Justified Inconsistent Beliefs, and argue that coherentists can give at least a promising line of response to each of them.

The paper takes off from the suggestion of Jouni-Matti Kuukkanen that Kuhn’s account of science may be understood in coherentist terms. There are coherentist themes in Kuhn’s philosophy of science. But one crucial element is lacking. Kuhn does not deny the existence of basic beliefs which have a non-doxastic source of justification. Nor does he assert that epistemic justification only derives from inferential relationships between non-basic beliefs. Despite this, the coherentist interpretation is promising and I develop it further in this (...) paper. I raise the question of whether Kuhn’s account of science can deal with the input objection to coherentism. I argue that the role played by problems in Kuhn’s theory of science ensures that there is input from the external world into scientists’ belief-systems. I follow Hoyningen-Huene in pointing to the causal role played by the external world in determining perceptual states. I next turn to the question of whether Kuhn’s rejection of foundationalism implies coherentism. I argue that Kuhn’s rejection of the one-to-one relation between object and experience is compatible with a foundationalist account of justification. Nor does Kuhn’s rejection of the given entail the same coherentist implications as Sellars’ critique of the myth of the given. (shrink)

In this chapter, I explain and critically examine Laurence BonJour's version of coherentism, as presented in his The Structure of Empirical Knowledge. Speaking roughly, BonJour holds that an empirical belief has warrant only if it is an element in a system of beliefs that is coherent in the long run. Somewhat less roughly, BonJour holds that an empirical belief B has warrant for a person S if and only if S has a reason for thinking B to be true; (...) and that reason, on BonJour's view, can only be the conjunction of B being a member of S's system of beliefs, and that system is coherent and if B is a member of S's system of beliefs and S's system of beliefs has been coherent for a sufficiently long run, then B is likely to be true. After explaining BonJour's coherentism, I comment on two interesting facets of BonJour's thought: his relationship to classical foundationalism and his trust in reason, and the success of his argument for a coherentist justification of empirical belief. Finally, and most importantly for the larger purpose of my book, I consider his conception of warrant, concluding that BonJourian coherence is neither sufficient nor necessary for warrant. (shrink)

The heart of coherentism is found in two aspects, one negative and one positive. On the negative side, coherentism is a contrary of foundationalism, the view that the epistemic status of our beliefs ultimately traces to, or derives from, basic beliefs.

In this chapter, I consider coherentism taken generally, and argue that it does not afford the resources for a satisfactory account of warrant. We can better understand coherentism, I think, by contrasting it with foundationalism; I accordingly begin with an examination of ordinary foundationalism. Turning next to coherentism, we find that the coherentist claims that coherence is both necessary and sufficient for warrant in that a proposition has warrant for me if and only if it is coherent (...) with my noetic structure or appropriately follows from propositions that are coherent with my noetic structure. I argue that the coherentist is wrong on both counts – coherence is neither necessary nor sufficient for warrant. I then close with a short discussion of classical foundationalism. (shrink)

This chapter explains moral coherentism as the view that some moral beliefs are justified by virtue of cohering with a system of belief that is coherent in the sense that it is consistent, connected, and comprehensive. Second-order beliefs about reliability are introduced to handle standard objections to coherentism. It concludes that coherence can make some moral beliefs justified out of a modest contrast class, but not out of an extreme contrast class with moral nihilism. This final chapter, together (...) with the rest of Part 2, thus leads to moderate moral skepticism. (shrink)

Coherentists fail to distinguish between the individual revision of a conviction and the intersubjective revision of a rule. This paper fills this gap. A conviction is a norm that, according to an individual, ought to be ascribed to a provision. By contrast, a rule is a judicially ascribed norm that controls a case and is protected by the formal principles of competence, certainty, and equality. A revision of a rule is the invalidation or modification such a judicially ascribed norm, provided (...) that the judge meets the burden of argumentation of formal principles. Thus, judges can revise their convictions without changing the law. (shrink)

While Process Reliabilism has long been regarded by many as a version of Foundationalism, this paper argues that there is a version of Process Reliabilism that can also been seen as at least a partial vindication of Coherentism as well. The significance of this result lies in what it tells us both about the prospects for a plausible Process Reliabilism, but also about the old-school debate between Foundationalists and Coherentists.

In the latter half of the twentieth century, foundationalist approaches to epistemology and philosophy of science were widely rejected in favour of holist and coherentist approaches. Kuhn may be regarded as a contributor to this anti-foundationalist tendency. In this paper, I wish to consider the extent to which Kuhn’s epistemological thinking was coherentist in nature. This is a task that has already begun in the work of Jouni-Matti Kuukkanen. However, I wish to go beyond Kuukkanen by raising a number of (...) questions that he does not address. First, I present Kuukkanen’s coherentist interpretation of Kuhn. In the next section, I argue that the interpretation fails to show that Kuhn rejects non-doxastic justification in favour of coherence relations among beliefs. In the fourth section, I present a standard objection to coherentism that any adequate formulation of the doctrine must confront, the “input objection”. I then frame the objection in terms of Kuhn’s model. In the fifth section, I argue that Kuhn’s account of science is able to satisfactorily deal with the input objection. In the sixth section, I explore the relationship between Kuhn’s treatment of perception and the anti-foundationalist tendency that contributed to the rise of coherentism. (shrink)

It is argued that a pure coherence theory of epistemic empirical justification fails to avoid an isolation objection according to which empirical justification has been divorced from one's total empirical evidence. Also, it is shown that several recent efforts to meet this objection either are outright failures or are irrelevant inasmuch as they diverge from epistemic coherentism. The overall moral is that we should look beyond coherentism for an adequate theory of epistemic empirical justification.

It is argued that a pure coherence theory of epistemic empirical justification fails to avoid an isolation objection according to which empirical justification has been divorced from one's total empirical evidence. Also, it is shown that several recent efforts to meet this objection either are outright failures or are irrelevant inasmuch as they diverge from epistemic coherentism. The overall moral is that we should look beyond coherentism for an adequate theory of epistemic empirical justification.

It is sometimes assumed in the Bayesian coherentist literature that the project of finding a truth-conducive measure of coherence of testimonial contents will, if successful, be helpful to the coherentist theory of justification. Various impossibility results in the Bayesian coherentist literature are consequently taken to be prima facie detrimental to the coherentist theory of justification. These attempts to connect Bayesian coherentism to the coherentist/ foundationalist debate in classical epistemology rest upon a confusion between the justification of a proposition and (...) the credibility that a proposition has for some other proposition. Foundationalism requires a class of beliefs that have non- inferential justification, not beliefs that have credibility by themselves for others. Coherentists insist that beliefs can be justified only via inferential relations with others, but this does not mean that coherentists must deny that individual propositions can have credibility for other propositions. I analyze and respond to both Erik Olsson's and Michael Huemer's arguments concerning the alleged connection between the Bayesian coherentist project and the coherentist theory of justification. Finally, I argue that Bayesian coherentism as represented in the literature, so far from being a version of coherentism, is implicitly foundationalist because of its treatment of “witness reports”, especially the reports of memory and sensation, as given evidence. The impossibility results, based on the assumption of given reports, are therefore not targeted at classical coherentism in epistemology at all. (shrink)

The paper challenges a recent attempt by Jouni-Matti Kuukkanen to show that since Thomas Kuhn’s philosophical standpoint can be incorporated into coherentist epistemology, it does not necessarily lead to: an abandonment of rationality and rational interparadigm theory comparison, nor to an abandonment of convergent realism. Leaving aside the interpretation of Kuhn as a coherentist, we will show that Kuukkanen’s first thesis is not sufficiently explicated, while the second one entirely fails. With regard to Thesis 1, we argue that Kuhn’s view (...) on inter-paradigm theory comparison allows only for ‘the weak notion of rationality’, and that Kuukkanen’s argument is thus acceptable only in view of such a notion. With regard to Thesis 2, we show that even if we interpret Kuhn as a coherentist, his philosophical standpoint cannot be seen as compatible with convergent realism since Kuhn’s argument against it is not ‘ultimately empirical’, as Kuukkanen takes it to be.Keywords: Thomas S. Kuhn; Jouni-Matti Kuukkanen; Coherentist epistemology; Rationality; Theory choice; Convergent realism. (shrink)

We prove that four theses commonly associated with coherentism are incompatible with the representation of a belief state as a logically closed set of sentences. The result is applied to the conventional coherence interpretation of the AGM theory of belief revision, which appears not to be tenable. Our argument also counts against the coherentistic acceptability of a certain form of propositional holism. We argue that the problems arise as an effect of ignoring the distinction between derived and non-derived beliefs, (...) and we suggest that the kind of coherence relevant to epistemic justification is the coherence of non-derived beliefs. (shrink)

RESUMO O artigo de E. Gettier, "É Conhecimento Crença Verdadeira Justificada?" mudou o curso da epistemologia ao analisar a questão da verdade justificada pertinente ao conhecimento proposicional e detectar uma falha na definição tradicional de conhecimento, dando origem a diferentes comentários. Várias teorias sobre o assunto são discutidas, sendo as mais utilizadas aquelas que enfatizam o fundacionismo e o coerentismo em seu caráter internalista. ABSTRACT E. Gettier's article "Is Justified True Belief Knowledge?" changed the course of epistemology by analyzing the (...) issue of justified truth regarding propositional knowledge and detecting a problem with the traditional definition of knowledge. The paper discusses various theories on this matter, especially those that highlight foundationalism and coherentism in its internalist aspect. (shrink)

This paper considers a problem for Bayesian epistemology and proposes a solution to it. On the traditional Bayesian framework, an agent updates her beliefs by Bayesian conditioning, a rule that tells her how to revise her beliefs whenever she gets evidence that she holds with certainty. In order to extend the framework to a wider range of cases, Jeffrey (1965) proposed a more liberal version of this rule that has Bayesian conditioning as a special case. Jeffrey conditioning is a rule (...) that tells the agent how to revise her beliefs whenever she gets evidence that she holds with any degree of confidence. The problem? While Bayesian conditioning has a foundationalist structure, this foundationalism disappears once we move to Jeffrey conditioning. If Bayesian conditioning is a special case of Jeffrey conditioning, then they should have the same normative structure. The solution? To reinterpret Bayesian updating as a form of diachronic coherentism. (shrink)