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  1. Logical Culture as a Common Ground for the Lvov-Warsaw School and the Informal Logic Initiative.Ralph H. Johnson & Marcin Koszowy - 2018 - Studies in Logic, Grammar and Rhetoric 55 (1):187-229.
    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 so that they may be able to apply their skills (...)
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  • A Probabilistic Analysis of Argument Cogency.David Godden & Frank Zenker - 2018 - Synthese 195 (4):1715-1740.
    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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  • How to Formalize Informal Logic.Douglas Walton & Thomas F. Gordon - unknown
    This paper presents a formalization of informal logic using the Carneades Argumentation System, a formal, computational model of argument that consists of a formal model of argument graphs and audiences. Conflicts between pro and con arguments are resolved using proof standards, such as preponderance of the evidence. Carneades also formalizes argumentation schemes. Schemes can be used to check whether a given argument instantiates the types of argument deemed normatively appropriate for the type of dialogue.
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  • Rationality, Reasonableness and Informal Logic: A Case Study of Chaim Perelman.Rongdong Jin & Christopher W. Tindale - unknown
    Perelman’s discussion about the distinction and relation between the rational and the reason-able could be seen as an attempt to bring forward a new understanding of rationality. In light of the concep-tion of situated reason, this paper argues that Perelman’s explication of the dialectic of the rational and the reasonable highlights the balance of universality and contexuality, and could contribute a fuller conception of rationality to establishing a solid philosophical foundation for Johnson’s informal logic.
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  • The Value of Genetic Fallacies.Andrew C. Ward - 2010 - Informal Logic 30 (1):1-33.
    Since at least the 1938 publication of Hans Reichenbach’s Experience and Predication , there has been widespread agreement that, when discussing the beliefs that people have, it is important to distinguish contexts of discovery and contexts of justification. Traditionally, when one conflates the two contexts, the result is a “genetic fallacy”. This paper examines genealogical critiques and addresses the question of whether such critiques are fallacious and, if so, whether this vitiates their usefulness. The paper concludes that while there may (...)
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  • Defeasibility From the Perspective of Informal Logic.Ralph H. Johnson - unknown
    The notions of defeasibility and defeasible reasoning have generated a great deal of interest in various research communities. Here I want to focus on their use in logic and argumentation studies. I will approach these topics from the perspective of an informal logician who finds himself struggling with some issues that surround the idea of and the deployment of the concept of defeasibility. My intention is to make those struggles as clear as I can.
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  • Logic, Reasoning, Argumentation: Insights From the Wild.Frank Zenker - forthcoming - Logic and Logical Philosophy.
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  • Some Reflections on the Informal Logic Initiative.Ralph H. Johnson - 2009 - Studies in Logic, Grammar and Rhetoric 16 (29).
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