Douglas Walton has done extensive and valuable work on the concepts of presumption and practical reasoning. However, Walton’s attempt to model practical reasoning as presumptive is misguided. The notions of “inference” and of the burden of proof shifting back and forth between proponent and respondent are misleading and lead to counterintuitive consequences. Because the issue in practical reasoning is a proposal, not a proposition, there are, in the standard case, several perfectly good reasons on both sides simultaneously, which implies that (...) argument appraisal necessarily contains a subjective element—a fact argumentation theory needs to conceptualize. (shrink)

Some proponents of epistemological approaches to argumentation assume that it should be possible to develop non-relative criteria of argument evaluation. By contrast, this paper argues that any evaluation of an argument depends on the cognitive situation of the evaluator, on background knowledge that is available for this evaluator in a certain situation, and --in some cases--on the belief-value-system this person shares.

Argumentation is pervasive in everyday life. Understanding what makes a strong argument is therefore of both theoretical and practical interest. One factor that seems intuitively important to the strength of an argument is the reliability of the source providing it. Whilst traditional approaches to argument evaluation are silent on this issue, the Bayesian approach to argumentation (Hahn & Oaksford, 2007) is able to capture important aspects of source reliability. In particular, the Bayesian approach predicts that argument content and source reliability (...) should interact to determine argument strength. In this paper, we outline the approach and then demonstrate the importance of source reliability in two empirical studies. These experiments show the multiplicative relationship between the content and the source of the argument predicted by the Bayesian framework. (shrink)

In this article, we argue for the general importance of normative theories of argument strength. We also provide some evidence based on our recent work on the fallacies as to why Bayesian probability might, in fact, be able to supply such an account. In the remainder of the article we discuss the general characteristics that make a specifically Bayesian approach desirable, and critically evaluate putative flaws of Bayesian probability that have been raised in the argumentation literature.

Norms—that is, specifications of what we ought to do—play a critical role in the study of informal argumentation, as they do in studies of judgment, decision-making and reasoning more generally. Specifically, they guide a recurring theme: are people rational? Though rules and standards have been central to the study of reasoning, and behavior more generally, there has been little discussion within psychology about why (or indeed if) they should be considered normative despite the considerable philosophical literature that bears on this (...) topic. In the current paper, we ask what makes something a norm, with consideration both of norms in general and a specific example: norms for informal argumentation. We conclude that it is both possible and desirable to invoke norms for rational argument, and that a Bayesian approach provides solid normative principles with which to do so. (shrink)

This discussion reviews the thinking of some prominent philosophers of argument to extract principles common to their thinking. It shows that a growing concern with dialogical pragmatics is better appreciated as a part of applied ethics than of applied epistemology. The discussion concludes by indicating a possible consequence for philosophy of argument and invites further discussion by asking whether argumentation philosophy has an implicit, underlying moral, or even political, posture.

Following a Toulmian account of argument analysis and evaluation, I offer a general unitary schema for, so called, deductive and inductive types of analogical arguments. This schema is able to explain why certain analogical arguments can be said to be deductive, and yet, also defeasible.

This introduction frames the contents of the special issue in terms of the arguments presented to us by contemporary media.

In lieu of an abstract, here is a brief excerpt of the content:Perelmanian Universal Audience and the Epistemic Aspirations of ArgumentScott F. AikinIThe notion of universality in argumentation is as fecund as is it is controversial. Chaïm Perelman and Lucie Olbrechts-Tyteca’s notion of universal audience (UA), given their requirement that all arguments be evaluated in terms of their audiences, clearly promises a rich account of argumentative norms. It equally yields a variety of questions. For the most part, the questions come (...) in three forms: what, precisely, is the universal audience; whether it is, in the end, a coherent notion; and how its norms actually constrain argument. Many objections to the notion claim that it is either incoherent or too empty to constrain. My objective here is to provide an account of Perelman’s notion of UA that avoids these objections. I will argue that the UA can be clarified with a distinction between two functions it plays in argumentation— one pragmatic and another epistemic. Perelman and Olbrechts-Tyteca do not explicitly disambiguate these roles themselves, though they do use the notion in two distinct ways in The New Rhetoric (TNR [1969]), and so it seems clear that although the view in the end may be Perelmanian, it is arguably not Perelman’s. No matter. The purpose of this essay is not to exhume Perelman but to resurrect and exercise his views. That is, historical work in philosophy must straddle the demands of two distinct goals— fidelity to the author in question and defensibility of the views developed. My case [End Page 238] will jointly depend on the comparative plausibility of my account as an interpretation of Perelman’s universal audience and of the view as correct regarding argumentative norms in relation to the other competing interpretations of Perelman’s UA. So if my argument for a divided universal audience is at least Perelmanian in spirit, and if it survives the objections to UA that other interpretations do not survive, it should be the philosophically preferable interpretation.IIThe first principle of Perelmanian rhetoric is that arguments are addressed to audiences for the purpose of inducing or increasing adherence to a view (TNR, 14). Consequently, the less reliant arguments are on a specific audience’s idiosyncratic commitments, the more effective the arguments will be in generating assent and resolving disagreements in wider and wider groups of people. Perelman describes the universal audience in The Realm of Rhetoric (RR [1982]) as “itself... made up of an infinite variety of particular audiences” (14). The UA is the regulative ideal of maximal intersubjective agreement. That is, we see both the relative weakness of arguments that depend on the commitments of particular audiences and “the value attached to opinions that enjoy unanimous approval” (TNR, 31). This unanimity is reached at its highest point in the universal audience. As such, UA is an agglomerative notion that functions as a criterion for how widely an argument may be given credence. Call this trajectory toward unanimity the pragmatic element of UA.However, the universal audience’s assent is used to define facts for arguments, and as such, it is a marker of the objectivity of a conclusion, not just the breadth of the effectiveness of an argument. Perelman and Olbrechts-Tyteca stipulate that “from the standpoint of argumentation, we are confronted with a fact only if we can postulate uncontroverted, universal agreement with respect to it” (TNR, 67). Facts and truths are defined in terms of the “agreement of the universal audience” (TNR, 67). This, of course, is not to say that arguments make facts but, instead, that their universal acceptability is a criterion for whether some purported fact is or is not the case. Agreement on this level does not play a metaphysical role of explanation but, rather, a cognitive role of justification for taking a commitment as a premise for further argument. The agreement in a universal audience, further, must be uncontroverted, which means that this UA must have some shared commitment that survives scrutiny (or at least is [End Page 239] not defeated): “The agreement of a universal audience is... a matter, not of fact, but of right” (TNR, 31). And further, this right has a very powerful normative element: “Argumentation... (shrink)

Humanist concerns to empower human beings and to promote justice inspired the modern argumentation movement. Turning to audience adherence and acceptability of inferential links raised a spectre of pernicious relativism that undermines concerns for justice. Invoking Perelman’s universal audi-ence as a remedy only begs the question with ‘whose universal audience?’ and frustrates fulfilling the jus-tice commitment. Turning discourse toward the common good better addresses concerns of justice and social justice.

Infusing logic with new rhetoric, dialogical pragmatics, and emphasizing argument context revolutionized the practice of logic. Critiquing oppressive practices and promoting justice, argumentationists empower participants to mediate their own argumentative situations. Against relativism to rescue the normative utility of good argument, argumentationists invoke the universal audience. Still, context-concerns eclipse its independence or resurrect rationalist absolutism. This vacillation imposes an external mediation that subverts establishing theoretical ground for promoting an empowering culture of justice.