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The informal logic movement began as an attempt to develop – and teach – an alternative logic which can account for the real life arguing that surrounds us in our daily lives – in newspapers and the popular media, political and social commentary, advertising, and interpersonal exchange. The movement was rooted in research and discussion in Canada and especially at the University of Windsor, and has become a branch of argumentation theory which intersects with related traditions and approaches (notably formal (...) |
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The last half of this century witnessed a proliferation of competing and complimentary theories of argumentation, initiated by the methodological shift from the "product" to the "process" of argument. This paper considers the effect of that shift by c omparing the different logical and epistemic status various theories assign to the standards of argument analysis and evaluation. In view of such differences, I argue that the systematic study of argumentation must clearly demarcate the normative and emp irical study of argumentation (...) |
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The issue of the relationship between formal and informal logic depends strongly on how one understands these two designations. While there is very little disagreement about the nature of formal logic, the same is not true regarding informal logic, which is understood in various (often incompatible) ways by various thinkers. After reviewing some of the more prominent conceptions of informal logic, I will present my own, defend it and then show how informal logic, so understood, is complementary to formal logic. |
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This paper offers a probabilistic treatment of the conditions for argument cogency as endorsed in informal logic: acceptability, relevance, and sufficiency. Treating a natural language argument as a reason-claim-complex, our analysis identifies content features of defeasible argument on which the RSA conditions depend, namely: change in the commitment to the reason, the reason’s sensitivity and selectivity to the claim, one’s prior commitment to the claim, and the contextually determined thresholds of acceptability for reasons and for claims. Results contrast with, and (...) |
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This paper is an exercise in intellectual history, an attempt to understand how a specific term—”informal logic”— came to be interpreted in so many different ways. I trace the emergence and development of “informal logic” to help explain the many different meanings, how they emerged and how they are related. This paper is also, to some degree, an account of a movement that developed outside the mainstream of philosophy, whose origins lie in a desire to make logic useful (echoing Dewey). |
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Rhetorical criticism examines ideology as a form of strategic argumentation that functions to legitimize political authority. Ideology presents itself as political philosophy in a way that calls attention to its argumentation. Ideological arguments support claims (1) that those who wield political power represent the interests of all, and (2) that the existing social order is natural and inevitable in light of human nature. Functionally, ideology is indispensible, but perverse. Formally, ideology is argumentation that obscures its partiality under claims to universality. |
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In this paper, we will explore two initiatives that focus on the importance of employing logical theories in educating people how to think and reason properly, one in Poland: The Lvov-Warsaw School; the other in North America: The Informal Logic Initiative. These two movements differ in the logical means and skills that they focus on. However, we believe that they share a common purpose: to educate students in logic and reasoning (logical education conceived as a process) so that they may (...) |
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Logic holds an important position in education in China, from primary to higher. The development and spread of logic as a discipline in China has a history of more than a century, beginning during... |
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The issue I address in this paper is the age-old problem of the relationship between logic and rhetoric. More specifically, I ask the question, how do logic and rhetoric differ in their approaches to the study of argumentation? What makes this question timely are the changes that logic has undergone in the last 25 years. In this paper, I develop the idea that an argument is the central event in what I call argumentative space. I present a conception of argumentative (...) |
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I characterize the deductivist ideal of justification and, following to a great extent Toulmin’s work The Uses of Argument, I try to explain why this ideal is erroneous. Then I offer an alternative model of justification capable of making our claims to knowledge about substantial matters sound and reasonable. This model of justification will be based on a conception of justification as the result of good argumentation, and on a model of argumentation which is a pragmatic linguistic reconstruction of Toulmin’s (...) |
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This paper examines, in studies utilizing Gilbert’s Multi-Modal Argumentation Model, processing of emotional arguments in ads which, due to Western Society’s bias, has tended toward logical analysis, even though they are emotional arguments. It explores reframing the analysis in the culture of Informal Logic, with particular reference to issues of the alethic status of premises, the ethics of claims, the context of assumptions, and the question of what constitutes truth in the context of emotions. |
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In this paper I develop and defend a form of argumentative normativity that is not based on fundamental principles. I first argue that research agendas that aim to discover fundamental principles of ‘good’ argumentative discourse share one crucial weak spot, viz. circularity. I then argue that this weak spot can be avoided in a pancritical view of normativity. |
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