In this paper it is shown how plausible reasoning of the kind illustrated in the ancient Greek example of the weak and strong man can be analyzed and evaluated using a procedure in which the pro evidence is weighed against the con evidence using formal, computational argumentation tools. It is shown by means of this famous example how plausible reasoning is based on an audience’s recognition of situations of a type they are familiar with as normal and comprehensible in their (...) shared common knowledge. The paper extends previous work on this example by using three new multiagent argumentation schemes closely related to the scheme for argument from negative consequences. (shrink)

The aim of this investigation is to explore the role of argumentation schemes in enthymeme reconstruction. This aim is pursued by studying selected cases of incomplete arguments in natural language discourse to see what the requirements are for filling in the unstated premises and conclusions in some systematic and useful way. Some of these cases are best handled using deductive tools, while others respond best to an analysis based on defeasible argumentations schemes. The approach is also shown to work reasonably (...) well for weak arguments, a class of arguments that has always been difficult to analyze without the principle of charity producing a straw man. (shrink)

The view that argumentation is a desired reasoning practice in the classroom is well reported in the literature. Nonetheless, it is still not clear what type of reasoning supports classroom argumentation. The paper discusses abductive reasoning as the most adequate for students’ arguments to emerge in a classroom discussion. Abductive reasoning embraces the idea of plausibility and defeasibility of both the premises and the conclusion. As such, teachers’ role becomes the one of guiding students through formulating relevant hypotheses and selecting (...) the most plausible one according to criteria. Argumentation schemes are proposed as useful tools in this process.L'idée que l'argumentation est une pratique de raisonnement souhaitée en classe est bien documentée dans la littérature. Néanmoins, il n'est toujours pas clair quel type de raisonnement soutient l'argumentation en classe. Dans cet article on discute du raisonnement abductif comme étant le plus adéquat pour que les arguments des élèves émergent dans une discussion en classe. Le raisonnement abductif emploie l'idée de plausibilité et de la révocabilité des prémisses et de la conclusion. En tant que tel, le rôle des enseignants consiste à guider les élèves à formuler des hypothèses pertinentes et à sélectionner le plus plausible selon des critères. Les schèmes d'argumentation sont proposés comme des outils utiles dans ce processus. (shrink)

France and New Caledonia are currently involved in an ongoing debate surrounding the independence of the latter from the former that will lead to referenda in 2018–2022. The main stakeholders in the negotiation process are France, the Caldoche population of the island agglomeration and its Kanak inhabitants. Most critical discourse studies analyse texts as expressions of power entrenched in monologues. In this paper, however, the debate between the social actors is seen as a plurilogue. The study argues that the dominant (...) interactants propagate a rhetoric of unity and homogeneity, aiming to further marginalise the Kanak people and other minority groups in New Caledonian society by rendering them invisible. It further argues that the French political power aims to persuade the other groups to accept the reality of a common destiny as a given truth. The paper combines Systemic Functional Linguistics and Pragma-dialectics, and incorporates postcolonial and poststructuralist perspectives into a critical study of discourse samples, taken from a larger corpus of French data, across various genres and registers. The analysis reveals that the French rhetoric of unity is built upon Republican principles inherent to neo-colonialist ideology. It also shows that the French rhetoric is being reproduced by local settler interactants, based on values that pertain to Caldoche nationalist ideology. Both French and Caldoche ideologies are in discord with Kanak socialist ideology. By exposing the existing power inequalities the study does not only contribute to defending the Kanak minority discourse, but also emphasises the rights for recognition and self-determination of the Kanak indigenous people of New Caledonia. (shrink)

Traditionally, an enthymeme is an incomplete argument, made so by the absence of one or more of its constituent statements. An enthymeme resolution strategy is a set of procedures for finding those missing elements, thus reconstructing the enthymemes and restoring its meaning. It is widely held that a condition on the adequacy of such procedures is that statements restored to an enthymeme produce an argument that is good in some given respect in relation to which the enthymeme itself is bad. (...) In previous work, we emphasized the role of parsimony in enthymeme resolution strategies and concomitantly downplayed the role of charity . In the present paper, we take the analysis of enthymemes a step further. We will propose that if the pragmatic features that attend the phenomenon of enthymematic communication are duly heeded, the very idea of reconstructing enthymemes loses much of its rationale, and their interpretation comes to be conceived in a new light. (shrink)

Enthymemes are traditionally defined as arguments in which some elements are left unstated. It is an empirical fact that enthymemes are both enormously frequent and appropriately understood in everyday argumentation. Why is it so? We outline an answer that dispenses with the so called "principle of charity", which is the standard notion underlying most works on enthymemes. In contrast, we suggest that a different force drives enthymematic argumentation—namely, parsimony, i.e. the tendency to optimize resource consumption, in light of the agent's (...) goals. On this view, the frequent use of enthymemes does not indicate sub-optimal performance of arguers, requiring appeals to charity for their redemption. On the contrary, it is seen as a highly adaptive argumentation strategy, given the need of everyday reasoners to optimize their cognitive resources. Considerations of parsimony also affect enthymeme reconstruction, i.e. the process by which the interpreter makes sense of the speaker's enthymemes. Far from being driven by any pro-social cooperative instinct, interpretative efforts are aimed at extracting valuable information at reasonable costs from available sources. Thus, there is a tension between parsimony and charity, insofar as the former is a non-social constraint for self-regulation of one's behaviour, whereas the latter implies a pro-social attitude. We will argue that some versions of charity are untenable for enthymeme interpretation, while others are compatible with the view defended here, but still require parsimony to expose the ultimate reasons upon which a presumption of fair treatment in enthymeme reconstruction is founded. (shrink)

In recent times, there have been different attempts to make an interesting use of the concept of script (as inherited from the fields of psychology and cognitive sciences) within argumentation theory. Although, in many cases, what we find under this label are computerized routines mainly used in e-learning collaborative proceses involving argumentation, either as an educational means or an educational goal, there are also other studies in which the concept of script plays a more theoretical role as the kind of (...) commonly human cognitive structure that could account for the way in which argumentation might develop in ordinary language and ordinary settings. We aim at exploring these latter possibilities, differentiating between the global ascription of the script concept to argumentation practices as procedural and regulated actions from the somewhat more suggestive association between socially shared scripts (expected narratives, plausible sequences, customary experiences, etc.) and the way some enthymemes work from an interactive, rhetorical perspective. The concept of script could help us understand some more procedural than propositional aspects of the cognitive sets shared by arguer and audience and account for the communicative success of apparently defective argumentation. (shrink)

Arystoteles wyodrębnił w Organonie dwa rodzaje rozumowań: analityczne i dialektyczne. Badaniami rozumowań analitycznych, które podjął w Analitykach I i II, zasłużył sobie na miano ojca logiki formalnej. Według Chaima Perelmana, współczesnym logikom umknął z pola widzenia fakt, że rozważania Arystotelesa na temat rozumowań dialektycznych – podjęte w Topikach, Retoryce i O dowodach sofistycznych – czynią zeń także ojca teorii argumentacji. Niniejszy artykuł jest próbą odpowiedzi na tę diagnozę. Jego celem jest potwierdzenie tezy Perelmana o jednorodności Arystotelesowskiej koncepcji sylogizmu teoretycznego i (...) praktycznego. W tym potwierdzeniu kluczową rolę odgrywa pojęcie entymematu. W artykule odpowiadamy na pytanie, jakie miejsce zajmuje ono w teorii retoryki Arystotelesa i porównujemy je z ogólnym pojęciem sylogizmu. Szkicujemy też strukturę argumentacji przez entymemat oraz przedstawiamy dwa typy entymematów omawiane przez Arystotelesa: pozorne i obalające. (shrink)

In the Organon, Aristotle distinguished two types of reasoning: analytical and dialectical. His studies on analytical reasoning in the Prior and Posterior Analytics, earned him the title of the father of formal logic. According to Chaim Perelman, modern logicians have failed to see the fact that Aristotle’s considerations on dialectical reasoning in the Topics, the Rhetoric and the Sophistical Refutations made him also the father of the theory of argumentation. This article attempts to answer this diagnosis. Our aim is to (...) prove Perelman’s thesis on the homogeneity of Aristotle’s concept of theoretical and practical syllogism. The key concept in this proof is that of the enthymeme. In the article, we will try to answer the question of what place the enthymeme occupies in Aristotle’s theory of rhetoric and confront it with the concept of a syllogism. We will also outline the structure of argumentation that makes use of the enthymeme, and present two types of enthymemes discussed by Aristotle: the apparent enthymeme and the refutative enthymeme. (shrink)

The implicit dimension of enthymemes is investigated from a pragmatic perspective to show why a premise can be left unexpressed, and how it can be used strategically. The relationship between the implicit act of taking for granted and the pattern of presumptive reasoning is shown to be the cornerstone of kairos and the fallacy of straw man. By taking a proposition for granted, the speaker shifts the burden of proving its un-acceptability onto the hearer. The resemblance of the tacit premise (...) with what is commonly acceptable or has been actually stated can be used as a rhetorical strategy. (shrink)

Imagine the following situation: an act of violent assault has been committed. And there are only two possible suspects, of which one is a small and weak man and the other a big and strong man. The weak man will plead that he is not strong enough and therefore not likely to have committed the crime, which seems reasonable straight away. But there will also be a loophole for the strong man, as Aristotle tells us, who reports exactly that story (...) in book 2, chapter 24, of his Rhetoric. And he also has a name to assign to the inventor of that kind of argument (1402a17–20):The Art of Corax is composed of this topic. For if a man is not likely to be guilty of what he is accused of, for instance if, being weak, he is .. (shrink)

Typically, common knowledge is taken as grounds for the acceptability of a claim, while appeals to popularity are seen as fallacious attempts to support a claim. This paper poses the question of whether there is any categorical difference between appeals to common knowledge and appeals to popular opinion as argumentative moves. In answering this question, I argue that appeals to common knowledge do not, on their own, provide adequate grounds for a claim’s acceptability.

For several millennia now, the enthymeme has been taught, on the putative authority of Aristotle, as "a kind of syllogism" —that is, a rhetorical syllogism—that consists in a three-part unit of deductive reasoning that parallels the inductive reasoning of the example. The rhetorical syllogism is said to be imperfect or incomplete because it relies on probable or particular rather than certain or universal premises and because the speaker suppresses one premise or the conclusion, usually the major premise, leaving it with (...) only two stated terms as follows:Socrates is a manSocrates is mortalOne premise is left unstated because it is known to the members of the audience (they... (shrink)

Bad jokes are not simply non-humorous texts. They are texts that are humorous for someone––their author at least––but not for their audience. Bad jokes thus involve a contextual––pragmatic––dimension that is neglected in the semantic theories of humor. In this paper, we propose an approach to humor based on the Aristotelian notion of surprising enthymemes. Jokes are analyzed as kinds of arguments, whose tacit dimension can be retrieved and justified by considering the “logic” on which it is based. However, jokes are (...) based on specific pragmatic conditions: they are regarded as arguments grounded on a generalization that is at the same time uncommon, retrievable, and acceptable or plausible for the audience. This perspective integrates the “local logic” of jokes within a broader rhetorical theory that ultimately rests on the communicative notion of common ground. (shrink)

Astroturf organizations are fake grassroots organizations usually sponsored by large corporations to support any arguments or claims in their favor, or to challenge and deny those against them. They constitute the corporate version of grassroots social movements. Serious ethical and societal concerns underline this astroturfing practice, especially if corporations are successful in influencing public opinion by undertaking a social movement approach. This study is motivated by this particular issue and examines the effectiveness of astroturf organizations in the global warming context, (...) wherein large corporate polluters have an incentive to set up astroturf organizations to undermine the importance of human activities in climate change. We conduct an experiment to determine whether astroturf organizations have an impact on the level of user certainty about the causes of global warming. Results show that people who used astroturf websites became more uncertain about the causes of global warming and humans’ role in the phenomenon than people who used grassroots websites. Astroturf organizations are hence successful in promoting business interests over environmental protection. In addition to the multiple business ethics issues it raises, astroturfing poses a significant threat to the legitimacy of the grassroots movement. (shrink)

Arguments which in their premises or warrants touch basic norms and values of a cultural community can be defined as culture sensitive. The paper will demonstrate how insensitivity to the cultural backgrounds of audiences may spoil an argument, and identify which kinds of arguments prove particularly open to cultural sensitivity. It will define the areas on which cultural communities may differ and determine how this bears on problems of globalization and political correctness.

We argue that common knowledge, of the kind used in reasoning in law and computing is best analyzed using a dialogue model of argumentation (Walton & Krabbe 1995). In this model, implicit premises resting on common knowledge are analyzed as endoxa or widely accepted opinions and generalizations (Tardini 2005). We argue that, in this sense, common knowledge is not really knowledge of the kind represent by belief and/or knowledge of the epistemic kind studied in current epistemology. This paper takes a (...) different approach, defining it in relation to a common commitment store of two participants in a rule-governed dialogue in which two parties engage in rational argumentation (Jackson & Jacobs 1980; van Eemeren & Grootendorst 2004). A theme of the paper is how arguments containing common knowledge premises can be studied with the help of argumentation schemes for arguments from generally accepted opinion and expert opinion. It is argued that common knowledge is a species of provi- sional acceptance of a premise that is not in dispute at a given point in a dia- logue, but may later be defeated as the discussion proceeds . (shrink)

The history of fallacy theory is long, distinguished and, admittedly, checkered. I offer a bird eye view on it, with the aim of contrasting the standard conception of fallacies as attractive and universal errors that are hard to eradicate with the contemporary preoccupation with “non-fallacious fallacies”, that is, arguments that fit the bill of one of the traditional fallacies but are actually respectable enough to be used in appropriate contexts. Godden and Zenker have recently argued that reinterpreting alleged fallacies as (...) non-fallacious arguments requires supplementing the textual material with something else, e.g. probability distributions, pragmatic considerations, dialogical context. Thus fallacies remain gappy on all accounts, and this is the hallmark of their failure. However, I argue that such gappiness is typically unproblematic, and thus no more flawed than enthymematic argumentation in general. This, in turn, calls into question the usefulness of the very notion of fallacy. (shrink)