Bipolar argument graphs represent the structure of complex pro and contra arguments for one or more standpoints. In this article, ampliative and exclusionary principles of evaluating argument strength in bipolar acyclic argumentation graphs are laid out and compared to each other. Argument chains, linked arguments, link attackers and supporters, and convergent arguments are discussed. The strength of conductive arguments is also addressed but it is argued that more work on this type of argument is needed to properly distinguish argument strength (...) from more general value-based components of such arguments. The overall conclusion of the article is that there is no justifiably unique solution to the problem of argument strength outside of a particular epistemological framework. (shrink)

Whether abduction is treated as an argument or as an inference, the mainstream view presupposes a tight connection between abduction and inference to the best explanation. This paper critically evaluates this link and supports a narrower view on abduction. Our main thesis is that merely the hypothesis-generative aspect, but not the evaluative aspect, is properly abductive in the sense introduced by C. S. Peirce. We show why equating abduction with IBE unnecessarily complicates argument evaluation by levelling the status of abduction (...) as a third reasoning mode. We also propose a scheme for abductive argument along with critical questions, and suggest retaining abduction alongside IBE as related but distinct categories. (shrink)

The concept of conductive argument weight was developed by Carl Wellman and later by Trudy Govier. This concept has received renewed attention recently from another informal logician, Robert C. Pinto. Argument weight has also been addressed in recent years by theorists in AI & Law. I argue from a non-technical perspective that some aspects of AI & Law’s approach to argument weight can be usefully applied to the issues addressed by Pinto. I also relate some of these issues to the (...) work of argument theorist Harald Wohlrapp. (shrink)

I discuss under what conditions the objection that an expert’s argument is biased by her self-interest can be a meaningful and sound argumentative move. I suggest replacing the idea of bias qua self-interest by that of a conflict of interests, exploit the distinction between an expert context and a public context, and hold that the objection can be meaningful. Yet, the evaluation is overall negative, because the motivational role of self-interest for human behavior remains unclear. Moreover, if recent social-psychological results (...) from the “heuristics and biases” program are accepted, it is plausible to assume that humans also satisfice (rather than optimize/maximize) when identifying and then acting in their self-interest. My thesis is: insofar as the objection is sound with a particular audience, it is not needed; and insofar as the objection is needed, it is unsound. (shrink)

In pro and con arguments, an arguer acknowledges that there are points against the conclu-sion reached. Such points have been called ‘counter-considerations.’ Their significance is explored here in the light of recent comments by Rongdong Jin, Hans Hansen and others. A conception of connector words such as “although”, “nevertheless,” and “but” is developed, as is a new model recognizing the need for an ‘on balance’ judgment in these arguments.

In this paper we describe the approach to critical thinking pedagogy used in our new text, Reason in the Balance: An Inquiry Approach to Critical Thinking. In this text we concentrate on develop-ing students’ ability to analyze and assess competing arguments in a dialectical context. This approach shifts the emphasis from the more common and traditional approach of evaluating individual arguments and fallacy identification. Our focus is on teaching students to analyze and assess competing arguments sur-rounding an issue with the (...) goal of achieving a reasoned and justifiable judgment. (shrink)

Wellman identified three types of conductive arguments, the third of which contains both pro and counter-considerations in the same piece of reasoning. This paper provides a pragma-dialectical analysis of this type of argumentation, with special focus on argumentation reconstruction. It argues that the account of pro/con argumentation in the framework of argument-as-product has problems solvable by a pragma-dialectical approach. The paper asserts that pro/con argumentation should be analyzed as a dialectical strategy of a protagonist, where acknowledgement of counter-considerations shows that (...) the antagonist’s reasons have been taken into consideration, although the pro-considerations override them. Thus, the pro-considerations of pro/con argumentation should be interpreted as the protagonist’s overriding defeaters of the antagonist’s counter-arguments, the protagonist incorporating the latter as counter-considerations. The paper further argues that the pragma-dialectical framework needs an additional conceptual tool to properly reconstruct complex forms of pro/con argumentation. Finally, the pragma-dialectical approach to reconstruct pro/con argumentation has several advantages, especially to a more logical-structural approach to complex pro/con argumentation. (shrink)

Normal.dotm 0 0 1 66 378 Thorbjoern Mann Consulting 3 1 464 12.256 0 false 18 pt 18 pt 0 0 false false false Normal.dotm 0 0 1 80 459 Thorbjoern Mann Consulting 3 1 563 12.256 0 false 18 pt 18 pt 0 0 false false false Arguments commonly used in discussions about design, planning, policy-making issues have not been adequately analyzed in the literature. The structure of such ‘planning arguments’ is discussed. Based on the conceptual framework of the (...) ‘argumentative model of planning’ proposed by H. Rittel, an approach for their systematic and transparent evaluation by discourse participants is presented. Procedural implications for its application in the planning process are discussed, and the potential for information technology support for such processes explored. (shrink)

RESUMO O objetivo deste artigo é discutir uma releitura do layout de argumentos proposto originalmente por Stephen Toulmin e desenvolvido posteriormente por Toulmin; Rieke; Janik no sentido de enquadrá-lo como: um instrumento útil para a análise da configuração funcional da argumentação epistêmica e, por conseguinte, para a avaliação da consistência da argumentação, o que está ligado à faceta justificatória de tal atividade; um instrumento válido para a análise do dissenso e do dialogismo, característicos da faceta comunicativa da argumentação, no que (...) diz respeito ao funcionamento da prova retórica do logos, um dos principais fatores envolvidos no processo de conquista da adesão. Nesse sentido, procedemos a uma reconceptualização dos componentes do layout de argumentos - Alegação, Dados, Garantia, Base, Qualificador e Refutação - e propomos uma noção de movimento argumentativo compatível com a nossa abordagem, que busca ser linguística, discursiva e cognitivamente coerente, respondendo a requisitos teóricos e analíticos ligados tanto à faceta justificatória quanto comunicativa da argumentação. ABSTRACT This paper aims to discuss a reframing of Toulmin’s layout of arguments, originally proposed in The Uses of Argument and further developed in An Introduction to Reasoning. In this approach, we conceive of the layout as: a useful instrument for analyzing the functional configuration of epistemic argumentation and, thus, for evaluating consistency, a dimension of analysis pertaining to the justificatory facet of argumentation; a valid instrument for analyzing dissension and dialogism, fundamental elements of the communicative facet of argumentation, in terms of the functioning of logos, one of the rhetorical proofs involved in the process of achieving adherence. Hence, we reconceptualize the components of the layout - Claim, Data, Warrant, Backing, Qualifier and Rebuttal - and propose a notion of argumentative move compatible with our approach, which aims at achieving linguistic, discursive and cognitive coherence and at responding to the theoretical and analytical requirements involved in the consideration of the justificatory and communicative facets of argumentation. (shrink)