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  1. Informal Logic: An Overview.J. Anthony Blair & Ralph H. Johnson - 2000 - Informal Logic 20 (2).
    In this overview article, we first explain what we take informal logic to be, discussing misconceptions and distinguishing our conception of it from competing ones; second, we briefly catalogue recent informal logic research, under 14 headings; third, we suggest four broad areas of problems and questions for future research; fourth, we describe current scholarly resources for informal logic; fifth, we discuss three implications of informal logic for philosophy in particular, and take note ofpractical consequences of a more general sort.
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  • The Port-Royal Logic's Theory of Argument.Maurice A. Finocchiaro - 1997 - Argumentation 11 (4):393-410.
    This is a critical examination of Antoine Arnauld's Logic or the Art of Thinking (1662), commonly known as the Port-Royal Logic. Rather than reading this work from the viewpoint of post-Fregean formal logic or the viewpoint of seventeenth-century intellectual history, I approach it with the aim of exploring its relationship to that contemporary field which may be labeled informal logic and/or argumentation theory. It turns out that the Port-Royal Logic is a precursor of this current field, or conversely, that this (...)
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  • The Relation between Formal and Informal Logic.Ralph H. Johnson - 1999 - Argumentation 13 (3):265-274.
    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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  • Making Sense of “Informal Logic”.Ralph H. Johnson - 2006 - Informal Logic 26 (3):231-258.
    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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  • Two Empirical Approaches to the Study of Reasoning.Maurice A. Finocchiaro - 1994 - Informal Logic 16 (1).
    David N. Perkins has studied everyday reasoning by an experimental-critical approach involving taped interviews during which subjects reflect on controversial issues and articulate their reasoning on both sides. The present author has studied scientific reasoning in natural language by an historical-textual approach involving the reconstruction and evaluation of the arguments in Galileo's Two Chief World Systems. They have, independently, reached the strikingly similar substantive conclusion that the most common flaw of informal reasoning is the failure to consider lines of argument (...)
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  • How Philosophical is Informal Logic?John Woods - 2000 - Informal Logic 20 (2).
    Consider the proposition, "Informal logic is a subdiscipline of philosophy". The best chance of showing this to be true is showing that informal logic is part of logic, which in turn is a part of philosophy. Part 1 is given over to the task of sorting out these connections. If successful, informal logic can indeed be seen as part of philosophy; but there is no question of an exclusive relationship. Part 2 is a critical appraisal of the suggestion that informal (...)
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  • Argumentation Practice: The Very Idea.Tone Kvernbekk - 2007 - In Christopher W. Tindale Hans V. Hansen (ed.), Dissensus and the Search for Common Ground. OSSA.
    In this paper I shall examine Ralph Johnson’s concept of argumentation practice. He provides the following three desiderata for a critical practice: It is teleological, it is dialectical, and it is manifestly rational. I shall argue that Johnson’s preferred definition of practice – which is MacIntyre’s concept of practice as human activity with internal goods accessible through participation in that same activity – does not satisfy his desiderata.
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