The naming of the field was preceded by the appearance of a number of textbooks that rejected the symbolic approach to logic on pedagogical grounds as inappropriate and unhelpful for introductory textbooks on logic for a general audience, for example Howard Kahane's Logic and Contemporary Rhetoric, subtitled "The Use of Reason in Everyday Life", first published in 1971.
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Douglas Walton, Informal Logic: A Handbook for Critical Argumentation, Cambridge, 1998