Inspired by legal reasoning, this paper presents a formal framework for assessing conflicting arguments. Its use is illustrated with applications to realistic legal examples, and the potential for implementation is discussed. The framework has the form of a logical system for defeasible argumentation. Its language, which is of a logic-programming-like nature, has both weak and explicit negation, and conflicts between arguments are decided with the help of priorities on the rules. An important feature of the system is that these (...) priorities are not fixed, but are themselves defeasibly derived as conclusions within the system. Thus debates on the choice between conflicting arguments can also be modelled.The proof theory of the system is stated in dialectical style, where a proof takes the form of a dialogue between a proponent and an opponent of an argument. An argument is shown to be justified if the proponent can make the opponent run out of moves in whatever way the opponent attacks. Despite this dialectical form, the system reflects a declarative, or relational approach to modelling legal argument. A basic assumption of this paper is that this approach complements two other lines of research in AI and Law, investigations of precedent-based reasoning and the development of procedural, or dialectical models of legal argument. (shrink)

Hamblin distinguished between formal and descriptive dialectic. Formal normative models of deliberation dialogue have been strongly emphasized as argumentation frameworks in computer science. But making such models of deliberation applicable to real natural language examples has reached a point where the descriptive aspect needs more interdisciplinary work. The new formal and computational models of deliberation dialogue that are being built in computer science seem to be closely related to some already existing and very well established computing technologies such as (...) problem solving and decision making, but whether or how dialectical argumentation can be helpful to support these systems remains an open question. The aim of this paper is to examine some real examples of argumentation that seem to hover on the borderlines between deliberation, problem solving and decision making. (shrink)

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 (...) class='Hi'>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)

The paper addresses the manner in which the theory of Coalescent Argumentation [CA] has been received by the Argumentation Theory community. I begin (section 2) by providing a theoretical overview of the Coalescent model of argumentation as developed by Michael A. Gilbert (1997). I next engage the several objections that have been raised against CA (section 3). I contend that objectors to the Coalescent model are not properly sensitive to the theoretical consequences of the genuinely (...) situated nature of argument. I conclude (section 4) by suggesting that the resolution to the dispute between Gilbert and his objectors hinges on the outcome of several foundational theoretical questions identified over the course of the paper. (shrink)

This paper addresses the problem posed by the current split between the two opposed hypotheses in the growing literature on the fallacy of begging the question the epistemic hypothesis, based on knowledge and belief, and the dialectical one, based on formal dialogue systems. In the first section, the nature of split is explained, and it is shown how each hypothesis has developed. To get the beginning reader up to speed in the literature, a number of key problematic examples are (...) analyzed illustrating how both approaches can be applied. Useful tools are brought to bear on them, including the automated argument diagramming system Araucaria, and profiles of dialogue used to represent circular argumentation in a dialogue tableau format. These tools are used to both to model circular reasoning and to provide the contextual evidence needed to properly determine whether the circular reasoning in a given case is better judged fallacious or not. A number of technical problems that have impeded the development of both hypotheses are studied. One central problem is the distinction between argument and explanation. It is concluded that the best way to move forward and solve these problems is to reformulate the two hypotheses in such a way that they might be able to co-exist. On this basis, a unified methodology is proposed that allows each hypothesis to move forward as a legitimate avenue for research using the same tools. (shrink)

We present a formal, mathematical model of argument structure and evaluation, taking seriously the procedural and dialogical aspects of argumentation. The model applies proof standards to determine the acceptability of statements on an issue-by-issue basis. The model uses different types of premises (ordinary premises, assumptions and exceptions) and information about the dialectical status of statements (stated, questioned, accepted or rejected) to allow the burden of proof to be allocated to the proponent or the respondent, as (...) appropriate, for each premise separately. Our approach allows the burden of proof for a premise to be assigned to a different party than the one who has the burden of proving the conclusion of the argument, and also to change the burden of proof or applicable proof standard as the dialogue progresses from stage to stage. Useful for modeling legal dialogues, the burden of production and burden of persuasion can be handled separately, with a different responsible party and applicable proof standard for each. Carneades enables critical questions of argumentation schemes to be modeled as additional premises, using premise types to capture the varying effect on the burden of proof of different kinds of questions. (shrink)

The paper's thesis is that dialogue is not an adequate model for all types of argument. The position of Walton is taken as the contrary view. The paper provides a set of descriptions of dialogues in which arguments feature in the order of the increasing complexity of the argument presentation at each turn of the dialogue, and argues that when arguments of great complexity are traded, the exchanges between arguers are turns of a dialogue only in an extended or (...) metaphorical sense. It argues that many of the properties of engaged back-and-forth exchanges of paradigmatic argument dialogues are not found in ‘solo’ arguments, and that at least some of the norms appropriate to the former type of argument, such as some of the pragma-dialectical rules of van Eemeren and Grootendorst's model, do not apply to the latter. (shrink)

This paper describes the development of pragma-dialectics as a theory of argumentative discourse. First the development of the pragma-dialectical model of a critical discussion is explained, with the rules that are to be complied with in order to avoid fallacies from occurring. Then the integration is discussed of rhetorical insight in the dialectical framework. In this endeavour, the concept of strategic manoeuvring is explained that allows for a more refined and more profoundly justified analysis of argumentative discourse (...) and a better identification of fallacies. The paper ends with a brief overview of current research projects. (shrink)

In this book two of the leading figures in argumentation theory present a view of argumentation as a means of resolving differences of opinion by testing the acceptability of the disputed positions. Their model of a 'critical discussion' serves as a theoretical tool for analysing, evaluating and producing argumentative discourse. They develop a method for the reconstruction of argumentative discourse that takes into account all aspects that are relevant to a critical assessment. They also propose a practical (...) code of behaviour for discussants who want to resolve their differences in a reasonable way. This is a major contribution to the study of argumentation and will be of particular value to professionals and graduate students in speech communication, informal logic, rhetoric, critical thinking, linguistics, and philosophy. (shrink)

In this paper we describe a method for the specification of computationalmodels of argument using dialogue games. The method, which consists ofsupplying a set of semantic definitions for the performatives making upthe game, together with a state transition diagram, is described in full.Its use is illustrated by some examples of varying complexity, includingtwo complete specifications of particular dialogue games, Mackenzie's DC,and the authors' own TDG. The latter is also illustrated by a fully workedexample illustrating all the features of the game.

The standard account of denying the antecedent (DA) is that it is a deductively invalid form of argument, and that, in a conditional argument, to argue from the falsity of the antecedent to the falsity of the consequent is always fallacious. In this paper, we argue that DA is not always a fallacious argumentative strategy. Instead, there is a legitimate usage of DA according to which it is a defeasible argument against the acceptability of a claim. The dialectical effect (...) of denying the antecedent is to shift the burden of proof back to the original proponent of a claim. We provide a model of this non-fallacious usage which is built upon pragmatic models of argumentation. (shrink)

The overall goal of this paper is to show that computational modelling of argumentation theories is a useful tool to deepen them. Specifically, it provides a basic computational formalization of part of Pragma-dialectics’ model of a critical discussion, which serves as a basis for analyzing this influential theory of argumentation. Such analysis reveals some weaknesses and leaves some questions opened for Pragma-dialectics. Particularly, it shows that the model of a critical discussion is not independent of the (...) model of reasoning/inference chosen, because, while it performs differently with different models of reasoning, it does not work well with some of them. (shrink)

This paper focuses on the inferential configuration of arguments, generally referred to as argument scheme. After outlining our approach, denominated Argumentum Model of Topics (AMT, see Rigotti and Greco Morasso 2006, 2009; Rigotti 2006, 2008, 2009), we compare it to other modern and contemporary approaches, to eventually illustrate some advantages offered by it. In spite of the evident connection with the tradition of topics, emerging also from AMT’s denomination, its involvement in the contemporary dialogue on argument schemes should not (...) be overlooked. The model builds in particular on the theoretical and methodological perspective of pragma-dialectics in its extended version, reconciling dialectic and rhetoric; nevertheless, it also takes into account numerous other contributions to the study of argument schemes. Aiming at a representation of argument schemes able to monitor the inferential cohesion and completeness of arguments, AMT focuses on two components of argument scheme that could be distinguished, readapting pragma-dialectical terms, as procedural and material respectively. The procedural component is based on the semantic-ontological structure, which generates the inferential connection from which the logical form of the argument is derived. The material component integrates into the argument scheme the implicit and explicit premises bound to the contextual common ground (Rigotti 2006). In this paper, the comparison of the AMT to other approaches focuses on the inferential configuration of arguments and not on the typologies of argument schemes and on the principles they are based on, which the authors intend to tackle in a further paper. (shrink)

Previous papers have introduced the idea of a Dialectical Inquiring System (DIS), i.e., an Information System which for any issue presents strong pro and con arguments. The previous papers showed how the DIS could be made scientifically operational in terms of Russell Ackoff's Behavioral Theory of Communication. In this paper we show how the DIS can be represented in terms of Egon Brunswik's Lens Model. The Brunswik Lens Model formulation is most appropriate for the design of Behavioral (...) Science experiments. It also illuminates further properties of the DIS. We discuss both the use and current limitations of the model in terms of an example currently under experimental investigation. The paper, in effect, argues vigorously for a new methodology of science that is founded on anexplicit, systematic, andcontrolled use of conflict. (shrink)

Muhammad Arsyad Al-Banjari who lived from 1710 to 1812 in Borneo, Indonesia, applied a model of integrating uses of the Banjarese tradition into Islamic Jurisprudence based on a dialectical constitution of qiyās, the legal argumentation theory for parallel reasoning and analogy, he learned from the Shāfi‘ī-school of jurisprudence (uṣūl al-fiqh). Our paper focuses in the model of integration proposed and practiced by Al-Banjari, a rational debate grounded on a dynamic view on legal systems. We will illustrate (...) the method with the help of two different kinds of qiyās deployed by Al-Banjari in order to argue for the rejection of some traditional Banjarese offering-rituals for avoiding disease or calamities (manyanggar and mambuang pasilih), and for the acceptance of the use of consuming the traditional drink called lahang made of the juice of sugar-palm. As our dialogical reconstruction shows, the development of the debates, particularly the first one, is quite sophisticated, with a Banjarese opponent that does not surrender easily to the rejection of his use of those rituals. (shrink)

In this article it is argued that a complex model that includes Toulmin's functional account of argument, the pragma-dialectical stage analysis of argumentation offered by the Amsterdam School, and criteria developed in critical thinking theory, can be used to account for the normativity and field-dependence of argumentation in science. A pragma-dialectical interpretation of the four main elements of Toulmin's model, and a revised account of the double role of warrants, illuminates the domain specificity of (...) scientific argumentation and the restrictions to which the confrontation and opening stages of scientific critical discussions are subjected. In regard to the argumentation stage, examples are given to show that a general account of argumentation, as advocated by informal logicians, is not applicable to arguments in science. Furthermore, although patterns of inference differ in various scientific practices, deductive validity is argued to be a crucial notion in the assessment of scientific arguments. Finally, some remarks are made concerning the burden of proof and the concluding stage of scientific argumentation. (shrink)

Argumentation has remained under-researched in studies analyzing academic journal publications despite its importance in academic writing. This paper reports a study in which we investigated stereotypical argumentative trends, lexico-grammatical features, and interactional metadiscourse markers in 354 research article free-standing discussion sections from the journal of ESP over forty years. The field of ESP was chosen because of its maturity, which has given substance to a dynamic ground for arguments. We drew on the pragma-dialectical approach to analyzing argumentations in (...) the corpus. Findings indicated that due to the argumentative nature of the discussion section, certain argumentative trends recurred more often. The analysis of the lexico-grammatical features and metadiscourse markers of the standpoints also showed patterns of variability over time. The study concludes that it is imperative to incorporate relevant facets from various argumentation models to construct a comprehensive argumentation theory and gain deeper insights into argumentation in academic writing. (shrink)

"Habermas introduces the concept of “reconstructive science” with a double purpose: to place the “general theory of society” between philosophy and social science and reestablish the rift between the “great theorization” and the “empirical research”. The model of “rational reconstructions” represents the main thread of the surveys about the “structures” of the life-world (“culture”, “society” and “personality”) and their respective “functions” (cultural reproductions, social integrations and socialization). For this propose, the dialectics between “symbolic representation” of “the structures subordinated to (...) all worlds of life” (“internal relationships”) and the “material reproduction” of the social systems in their complex (“external relationships” between social systems and environment) has to be considered. This model finds an application, above all, in the “theory of the social evolution”, starting from the reconstruction of the necessary conditions for a phylogeny of the socio-cultural-life forms (the “hominization”) until an analysis of the development of “social formations”, which Habermas subdivides into primitive, traditional, modern and contemporary formations. This paper is an attempt, primarily, to formalize the model of “reconstruction of the logic of development” of “social formations” summed up by Habermas through the differentiation between vital world and social systems (and, within them, through the “rationalization of the life-world” and the “growth in complexity of the social systems”). Secondly, it tries to offer some methodological clarifications about the “explanation of the dynamics” of “historical processes” and, in particular, about the “theoretical meaning” of the evolutional theory’s propositions. Even if the German sociologist considers that the “ex-post rational reconstructions” and “the models system/environment” cannot have a complete “historiographical application”, these certainly act as a general premise in the argumentative structure of the “historical explanation”.". (shrink)

Can argumentation schemes play a part in the critical processing of argumentation by lay people? In a qualitative study, participants were invited to come up with strong and weak arguments for a given claim and were subsequently interviewed for why they thought the strong argument was stronger than the weak one. Next, they were presented with a list of arguments and asked to rank these arguments from strongest to weakest, upon which they were asked to motivate their judgments (...) in an interview. In order to assess whether lay people apply argument scheme specific criteria when performing these tasks, five different argumentation schemes were included in this study: argumentation from authority, from example, from analogy, from cause to effect, and from consequences. Laypeople’s use of criteria for argument quality was inferred from interview protocols. The results revealed that participants combined general criteria from informal logic and scheme-specific criteria. The results supported the conventional validity of the pragma-dialectical argument scheme rule in a strong sense and provided a more fine-grained view of central processing in the Elaboration Likelihood Model. (shrink)

While courts depend on expert opinions in reaching sound judgments, the role of the expert witness in legal proceedings is associated with a litany of problems. Perhaps most prevalent is the question of under what circumstances should testimony be admitted as expert opinion. We review the changing policies adopted by American courts in an attempt to ensure the reliability and usefulness of the scientific and technical information admitted as evidence. We argue that these admissibility criteria are best seen in a (...) dialectical context as a set of critical questions of the kind commonly used in models of argumentation. (shrink)

The ubiquity of inner awareness thesis states that all conscious states of normal adult humans are characterised by an inner awareness of that very state. UIA-Backers support this thesis while UIA-Skeptics reject it. At the heart of their dispute is a recalcitrant phenomenological disagreement. UIA-Backers claim that phenomenological investigation reveals ‘peripheral inner awareness’ to be a constant presence in their non-introspective experiences. UIA-Skeptics deny that their non-introspective experiences are characterised by inner awareness, and maintain that inner awareness is only gained (...) when they explicitly introspect. Each camp has put forward a range of arguments designed to resolve this dispute, but I argue that none of these arguments has genuine dialectical purchase. This leads me to develop a compromise position that trades on the contribution that affordances can make to our phenomenology. According to the Affordance Model of inner awareness, all conscious states of normal adult humans are characterised by an affordance of introspectability. In line with the UIA-Skeptic, non-introspective experiences are not characterised by inner awareness. But against the traditional UIASkeptic, non-introspective experiences are characterised by an awareness of the opportunity for introspection. On this view, our capacity to gain inner awareness of our current experience is a ubiquitous feature of our phenomenology. I show how the Affordance Model respects the driving phenomenological intuitions of both the UIA-Backers and the traditional UIA-Skeptics, and suggest that it is able to explain why neither camp achieves an accurate description of how inner awareness figures in their phenomenology. (shrink)

This paper is focused on the theory of drives, particularly on its economic model, which was an integral part of Freud’s original formulation. Freud was aiming to make a link between the psychic energy of drives and the biophysical rules of nature. However, he was not able to develop this model into a comprehensive system linking the body and the mind. The further development of psychoanalytic theory, in various attempts to comprehend the theory of drives, can be described (...) as taking different approaches. Some of them equate drives with bodily impulses, others abandon the economic model, a few stay with Freud’s original model. I believe that the Friston notion of free energy and the hierarchical model of the brain allows us to develop this model and to integrate the economic model into some contemporary theories of drives. I argue against those theories equating drives with biological impulses. My arguments are supported by Freud’s project itself but also by recent developments within neuro-psychoanalysis describing the process of mentalizing homeostasis, interoceptive signals and relations with caregivers. I argue for those theories which see the drives as psychic forces, which through developmental processes and cathexes acquire aims and objects, and become intertwined with impulses originating internally and externally, such as affect, interoceptive impulses, perception of the external world, and impulses from erotogenic zones in particular. Here, I present my analysis of the compatibility and consistency of free energy and the hierarchical model perspective, and two psychoanalytical traditions of thoughts: French psychoanalysis and the post-Kleinian school of British psychoanalysis. In particular, my analysis focuses on the contemporary Kleinian notion of unconscious phantasies, especially Bronstein’s description of their semiotic aspects. Secondly, I look at Segal’s view of drives as dialectic forces of adaptation vs. conservatism. Analyzing the French tradition, I focus on Green’s perspective on the drives, Lacan’s distinction between drives and desire, and Penot’s description of the process of subjectivation. I conclude that free energy, as described by Friston, can be seen as a source of the drives’ energy and the process of minimizing it is an equivalent of what Freud described as binding the free energy, in which psychic unbound energy acquires distinctive features and becomes bound. (shrink)

In this article the author develops a framework for a pragma-dialectical reconstruction of teleological argumentation in a legal context. Ideas taken from legal theory are integrated in a pragma-dialectical model for analyzing and evaluating argumentation, thus providing a more systematic and elaborate framework for assessing the quality of teleological arguments in a legal context. Teleological argumentation in a legal context is approached as a specific form of pragmatic argumentation. The legal criteria that are (...) relevant for the evaluation of teleological argumentation are discussed and translated in terms of critical questions that are relevant for the evaluation of the various forms of teleological argumentation. (shrink)

The book offers a compact but comprehensive introductory overview of the crucial components of argumentation theory. In presenting this overview, argumentation is consistently approached from a pragma-dialectical perspective by viewing it pragmatically as a goal-directed communicative activity and dialectically as part of a regulated critical exchange aimed at resolving a difference of opinion. As a result, the book also systematically explains how the constitutive parts of the pragma-dialectical theory of argumentation, which are discussed in a (...) number of separate publications, hang together. The following crucial topics are discussed: argumentation theory as a discipline; the meta-theoretical principles of pragma-dialectics; the model of a critical discussion aimed at resolving a difference of opinion; fallacies as violations of a code of conduct for reasonable argumentative discourse; descriptive research of argumentative reality; analysis as theoretically-motivated reconstruction; strategic manoeuvring aimed at combining achieving effectiveness with maintaining reasonableness; the conventionalization of argumentative practices; prototypical argumentative patterns; pragma-dialectics amidst other approaches. Argumentation Theory: A Pragma-Dialectical Perspective is clearly written and makes argumentation theory understandable to all scholars and advanced students interested in argumentation research. (shrink)

Ralph Johnson argues that mathematical proofs lack a dialectical tier, and thereby do not qualify as arguments. This paper argues that, despite this disavowal, Johnson’s account provides a compelling model of mathematical proof. The illative core of mathematical arguments is held to strict standards of rigour. However, compliance with these standards is itself a matter of argument, and susceptible to challenge. Hence much actual mathematical practice takes place in the dialectical tier.

This paper begins a working through of Blair’s (2001) theoretical agenda concerning argumentation schemes and their attendant critical questions, in which we propose a number of solutions to some outstanding theoretical issues. We consider the classification of schemes, their ultimate nature, their role in argument reconstruction, their foundation as normative categories of argument, and the evaluative role of critical questions.We demonstrate the role of schemes in argument reconstruction, and defend a normative account of their nature against specific criticisms due (...) to Pinto (2001). Concerning critical questions, we propose an account on which they are founded in the R.S.A. cogency standard, and develop an account of the relationship between critical questions and burden of proof. Our ultimate aim is to initiate a reconciliation between dialectical and informal logic approaches to the schemes. (shrink)

This essay attempts to investigate the prospects for a certain model of rational argumentation, what we call a dialectical model. More specifically, we assess the utility of this model for the purposes of inquiry. Dialectical inquiry consists in a rule-governed discussion between two or more interlocutors in which the acceptability of a claim is determined by laying out and criticizing the support available for it. Models of dialectical argumentative discussion have been proposed before, (...) and part of this work consists in a critical outline of three relatively recent models, those of Rescher, Toulmin, and van Eemeren and Grootendorst. The remainder of the essay evaluates and defends a set of standards of dialectical adequacy. We defend cogency standards of acceptability, relevance, and sufficiency and pragmatic standards embodied in a set of rules of discussion. The impetus of the work is a desire to have a model through which we may rationally assess the acceptability of claims.Dept. of Philosophy. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1990.J674. Source: Masterss International, Volume: 30-03, page: 0419. Thesis --University of Windsor, 1990. (shrink)

In Argumentation Theory: A Pragma-Dialectical Perspective (2018), Professor van Eemeren suggests that it might be worthwhile for pragma-dialectics and informal logic to join forces, given that there is a “considerable amount of common ground” between the two. In this paper, we explore that common ground by considering both the ways logic is understood and incorporated in the pragma-dialectical model and the ways informal logic has developed since its inception in the 1970s. In the process of our (...) investigation, we present a view of the landscape of argumentation in which the subject matter of informal logic is situated relative to theories of argumentation. (shrink)

This paper throws some light on the nature of argumentation, its use and advantages, within the setting of doctor–patient interaction. It claims that argumentation can be used by doctors to offer patients reasons that work as ontological conditions for enhancing the decision making process, as well as to preserve the institutional nature of their relationship with patients. In support of these claims, selected arguments from real-life interactions are presented in the second part of the paper, and analysed by (...) means of a model of argumentation borrowed from classical rhetoric, and refined according to the modern orientation of the pragma-dialectic approach. (shrink)

Both questions as abstract objects and the speech acts, here called requests, by which we ask them play an enormous role in all argumentative practices. Nonetheless, there is hardly a proper systematic treatment of questions and requests in current argumentation theories. This paper is a first attempt at providing such a systematic treatment. This is achieved by following the ideal model of a critical discussion as elaborated over the years by the Amsterdam school of pragma-dialectics. After introducing the (...) distinction between questions and requests, the paper sets forth and illustrates the norms of questioning which implicitly underlie the four stages of a critical discussion in the standard order: confrontation, opening, argumentation, and conclusion. Among other things, it is shown that crucial insights of pragma-dialectics are illuminated by the questioning perspective, in particular the distinction between single and multiple differences of opinion, the duties of the antagonist and protagonist roles, the precise character of the argumentation stage, and the different ways in which a disagreement can be resolved. (shrink)

Most dialectical models view argumentation as a process of critically testing a standpoint. Further, they assume that what we critically test can be analytically reduced to individual and bi-polar standpoints. I argue that these two assumptions lead to the dominant view of dialectics as a bi-partisan argumentative discussion in which the yes-side argues against the doubter or the no-side. I scrutinise this binary orientation in understanding argumentation by drawing on the main tenets of normative pragmatic and pragma- (...) class='Hi'>dialectical theories of argumentation. I develop my argument by showing how argumentative practice challenges these assumptions. I then lay out theoretical reasons for this challenge. This paves the way for an enhanced conceptualisation of dialectical models and their standards of rationality in terms of multi-party discussions, or argumentative polylogues. (shrink)

This chapter concentrates on the version of Putnam's argument set forth in his Reason, Truth and History. It explains how, in general terms, that argument is best conceived as working. Cursory inspection of Putnam's overall dialectic reveals it to incorporate three sub‐arguments, collectively designed to show that the metaphysical realist confronts an insuperable problem over explaining how our words may possess determinate reference. The chapter considers Putnam's version of the Permutation Argument, aimed at showing that reference cannot be determined by (...) fixing the truth‐conditions of whole sentences. It then reviews Putnam's 'just more theory' argument, designed to show that the metaphysical realist cannot rescue the situation by appeal to causal or other natural connections between our words and the world. The chapter considers how the considerations adduced by Hilary Putnam might be seen as an argument telling selectively against metaphysical realism. (shrink)

The study of argumentation is prospering. After its brilliant start in Antiquity, highlighted in the classical works of Aristotle, after an alternation of ups and downs during the following millennia, in the post-Renaissance period its gradual decline set in. Revitalization took place only after Toulmin and Perelman published in the same year their landmark works The Uses of Argument and La nouvelle rhétorique. The model of argumentation presented by Toulmin and Perelman’s inventory of argumentation techniques inspired (...) a great many scholars in various ways to take up the study of argumentation in a serious manner. Nowadays there are well-established logical approaches to argumentation, but also social and socio-psychological, linguistic, juridical and other approaches. In most of these approaches traces can be found of the influence of the classical and neo-classical argumentation theories just mentioned. (shrink)

. Artificial Intelligence (AI) has long dealt with the issue of finding a suitable formalization for commonsense reasoning. Defeasible argumentation has proven to be a successful approach in many respects, proving to be a confluence point for many alternative logical frameworks. Different formalisms have been developed, most of them sharing the common notions of argument and warrant. In defeasible argumentation, an argument is a tentative (defeasible) proof for reaching a conclusion. An argument is warranted when it ultimately prevails (...) over other conflicting arguments. In this context, defeasible consequence relationships for modelling argument and warrant as well as their logical properties have gained particular attention. This article analyzes two non-monotonic inference operators Carg and Cwar intended for modelling argument construction and dialectical analysis (warrant), respectively. As a basis for such analysis we will use the LDSar framework, a unifying approach to computational models of argument using Labelled Deductive Systems (LDS). In the context of this logical framework, we show how labels can be used to represent arguments as well as argument trees, facilitating the definition and study of non-monotonic inference operators, whose associated logical properties are studied and contrasted. We contend that this analysis provides useful comparison criteria that can be extended and applied to other argumentation frameworks. (shrink)

The ArgumentThe purpose of this article is twofold. Firstly, I propose to analyze controversies using a “dialectical” model, in the sense described in Aristotle'sTopics. This approach presupposes that we temporarily disregard, for the sake of clarity, the concreteness of real life controversies in order to focus on their argumentative structure. From this point of view, the main advantage of controversies is that they allow the interlocutorsto testeach other's claims and therefore to arrive at relatively corroborated conclusions. This testing (...) function in a dialectical context is implemented through theassentto commonly accepted premises, and thenecessitywhich characterizes each step of the reasoning.Secondly, I shall apply this dialectical framework to the study of the controversy concerning the motion of the Earth, or rather a small episode of it. I shall examine an exchange of letters, written in 1616 and in 1624 respectively, between Galileo Galilei and Francesco Ingoli, one of his Aristotelian opponents. I shall then compare this exchange with the first day of Galileo'sDialogue Concerning the Two Chief Systems of the World, a fictional debate, where Galileo discusses some of the same arguments. While the first exemplifies what I call “negative” testing, and yields a refutation of the opponent's theses, the second exemplifies “positive” testing and yields a dialectical demonstration of the motion of the Earth. (shrink)

Using tools like argument diagrams and profiles of dialogue, this paper studies a number of examples of everyday conversational argumentation where determination of relevance and irrelevance can be assisted by means of adopting a new dialectical approach. According to the new dialectical theory, dialogue types are normative frameworks with specific goals and rules that can be applied to conversational argumentation. In this paper is shown how such dialectical models of reasonable argumentation can be applied (...) to a determination of whether an argument in a specific case is relevant are not in these examples. The approach is based on a linguistic account of dialogue and text from congruity theory, and on the notion of a dialectical shift. Such a shift occurs where an argument starts out as fitting into one type of dialogue, but then it only continues to makes sense as a coherent argument if it is taken to be a part of a different type of dialogue. (shrink)

This paper describes an approach to legal logic based on the formal analysis of argumentation schemes. Argumentation schemes a notion borrowed from the .eld of argumentation theory - are a kind of generalized rules of inference, in the sense that they express that given certain premises a particular conclusion can be drawn. However, argumentation schemes need not concern strict, abstract, necessarily valid patterns of reasoning, but can be defeasible, concrete and contingently valid, i.e., valid in certain (...) contexts or under certain circumstances. A method is presented to analyze argumentation schemes and it is shown how argumentation schemes can be embedded in a formal model of dialectical argumentation. (shrink)

This paper offers a review of the argumentation-theoretical literature on metaphor in argumentative discourse. Two methodologies are combined: the pragma-dialectical theory is used to study the argumentative functions attributed to metaphor, and distinctions made in metaphor theory and the three-dimensional model of metaphor are used to compare the conceptions of metaphor taken as starting point in the reviewed literature. An overview is provided of all types of metaphors distinguished and their possible argumentative functions. The study reveals that (...) not all possible argumentative functions of metaphor have been taken into account, such as the role of conventional direct metaphors in standpoint and starting point. Novel direct metaphor as part of an analogy argument has received most attention, while indirect metaphor can constitute argumentative moves as well, such as the introduction of a standpoint, starting point or connection premise. The overview also shows that certain combinations of variables seem to be impossible of unlikely to occur. These results have a bearing on the analysis of metaphors in argumentative discourse and show the omission in current studies of metaphor. Being aware of these dimensions of metaphor ánd of its potential in argumentation would enrich argumentation studies and metaphor studies alike. (shrink)

It is shown that Aristotelian dialectic can be analyzed as having two parts: a core formal model that has a formal dialogue structure and a set of ten definable supplementary characteristics that lie outside the core structure. Some current argumentation tools used in artificial intelligence and multi-agent systems are applied to the task of extending the core formal model to include the supplementary characteristics. Using these tools it is explained how the structure of a dialogue can be (...) mapped into an argument diagram that can be analyzed and evaluated using standard argumentation techniques such as argumentation schemes, types of dialogue, critical questions and a dialectical concept of burden of proof. Disputed issues on how the elenchus fits the standard dialogue typology are discussed, and it is concluded that it fits best into a type of dialogue called examination dialogue that is closely related to persuasion dialogue. (shrink)

This paper has three dimensions, historical, theoretical and social. The historical dimension is to show how the Ciceronian system of dialectical argumentation served as a precursor to computational models of argumentation schemes such as Araucaria and Carneades. The theoretical dimension is to show concretely how these argumentation schemes reveal the interdependency of rhetoric and logic, and so the interdependency of the normative with the empirical. It does this by identifying points of disagreement in a dialectical (...) format through using argumentation schemes and critical questions. The social dimension is to show how the Ciceronian dialectical viewpoint integrates with the use of computational tools that can be used to support the principle of reason-based deliberation and facilitate deliberative democracy. (shrink)

Can arguments and their properties influence the development of issue polarisation in debates among artificial agents? This paper presents an agent-based model of debates with logical constraints based on the theory of dialectical structures. Simulations on this model reveal that the exchange of arguments can drive polarisation even without social influence, and that the usage of different argumentation strategies can influence the obtained levels of polarisation.

These two small works are a good supplement to Rescher’s recent trilogy. Whereas the systems-theoretic approach is employed in Methodological Pragmatism in dealing with the problem of the legitimation of claims to factual knowledge or cognitive rationality, Dialectics deals with the argumentation aspect of thesis-introduction rather than the logical aspect of thesis-derivation. Although some key notions such as the idea of burden of proof and presumption have been stated in the former work, what is offered here is a systematic (...) discussion of a disputational model of inquiry. The principal aims are "to exhibit the sociocommunal roots of the foundations of rationality, to provide an instrument for the critique of scepticism implicit in the cognitive solipsism of the Cartesian approach, and to illuminate the communal and controversy-oriented aspects of rational argumentation and inquiry—scientific inquiry in particular." Again, Rescher limits his discussion to "the probative mechanism in the factual domain." This book, if it were not for its price, should be a good supplement to a course in "informal" logic which focuses on argumentation rather than on mere evaluation of arguments. Plausible Reasoning provides the mechanism for evaluation of plausibility claims as distinct from probabilistic ones. The basic differences between these two types of claims are clearly discussed. "Plausibility is essentially a classificatory concept which ranks theses in terms of the standing and solidity of their cognitive basis. Plausibility grades theses by an external or extrinsic standard of the hierarchical nature of their supporting bases. It classifies propositions by the status of the evidential sources or validating principles that vouch for them. Probability weighs alternatives and evaluates theses by this relative contentual weight of the supporting considerations."—A.S.C. (shrink)

There has been increasing use of argument-based approaches in the development of safety-critical systems. Within this approach, a safety case plays a key role in the system development life cycle. The key components in a safety case are safety arguments, which are designated to demonstrate that the system is acceptably safe. Inappropriate reasoning in safety arguments could undermine a system's safety claims which in turn contribute to safety-related failures of the system. The review of safety arguments is therefore a crucial (...) step in the development of safety-critical systems. Reviews are conducted using dialogues where elements of the argument and their relations are proposed and scrutinised. This paper investigates an approach of conducting argument review using dialectical models. After studying five established dialectical models with varying strengths and drawbacks, a new dialectical model specially designed to support persuasion and information-seeking dialogues has been proposed to suit the requir... (shrink)

This paper investigates whether, and if so, in what way, argumentation can be profitably described in speech-act theoretical terms. I suggest that the two theories of argumentation that are supposed to provide the most elaborate analysis of it in speech-act theoretical terms (namely van Eemeren and Rob Grootendorst’s Pragma-Dialectics and Lilian Bermejo-Luque’s linguistic normative model of argumentation) both suffer from the same two flaws: firstly, their “illocutionary act pluralism” assumption and secondly, a lack of interest in (...) where arguing belongs in the classification of illocutionary acts. I argue that these flaws derive from the authors’ reliance on an intention-based speech-theoretical framework. Finally, I adopt a deontic framework for speech acts in order to propose an alternative way of accounting for argumentation which seems to overcome the two limitations outlined above. According to this framework, argumentation may be conceived as a speech act sequence, characterized by the conventional effects brought about by the communicative moves (as illocutionary acts) of which it is composed. (shrink)

Following and extending Searle’s speech act theory, both Pragma-Dialectics and the Linguistic Normative Model of Argumentation characterize argumentation as an illocutionary act. In these models, the successful performance of an illocutionary act of arguing depends on the securing of uptake, an illocutionary effect that, according to the Searlean account, characterizes the successful performance of any illocutionary act. However, in my view, there is another kind of illocutionary effect involved in the successful performance of an illocutionary act of (...) arguing, which affects both the speaker’s and the hearer’s set of rights, obligations, and entitlements. In order to give an account of this second type of effect, I will argue that it is necessary to distinguish two levels in the analysis of the illocutionary act of arguing. The first one is related to the illocutionary effect of securing of uptake and thus to the speech act performed by the speaker, while the second one allows us to account for the changes produced by the performance of the illocutionary act of arguing in the deontic modal competence of both the speaker and the hearer. (shrink)

Formal dialectic has its roots in ancient dialectic. We can trace this influence in Charles Hamblin’s book on fallacies, in which he introduced his first formal dialectical systems. Earlier, Paul Lorenzen proposed systems of dialogical logic, which were in fact formal dialectical systems avant la lettre, with roles similar to those of the Greek Questioner and Answerer. In order to make a comparison between ancient dialectic and contemporary formal dialectic, I shall formalize part of the Aristotelian procedure for (...) Academic debates. The resulting system will be compared (1) with Van Eemeren and Grootendorst’s system of rules of Critical Discussion (the pragma-dialectical discussion procedure), which must, however, first itself be reconstructed as a formal dialectical system, and (2) with a Hamblin-type system, and (3) a Lorenzen-type system. When drawing comparisons, it will become clear that there is a line to be drawn from Aristotle to formal dialectic and pragma-dialectics, extending to contemporary computational models of argument. (shrink)

The representation and classification of the structure of natural arguments has been one of the most important aspects of Aristotelian and medieval dialectical and rhetorical theories. This traditional approach is represented nowadays in models of argumentation schemes. The purpose of this article is to show how arguments are characterized by a complex combination of two levels of abstraction, namely, semantic relations and types of reasoning, and to provide an effective and comprehensive classification system for this matrix of semantic (...) and quasilogical connections. To this purpose, we propose a dichotomous criterion of classification, transcending both levels of abstraction and representing not what an argument is but how it is understood and interpreted. The schemes are grouped according to an end-means criterion, which is strictly bound to the ontological structure of the conclusion and the premises. On this view, a scheme can be selected according to the intended or reconstructed purpose of an argument and the possible strategies that can be used to achieve it. (shrink)