, Volume 13, Issue 2, pp 161–182 | Cite as

Rethinking the Fallacy of Hasty Generalization

  • Douglas Walton


This paper makes a case for a refined look at the so- called ‘fallacy of hasty generalization’ by arguing that this expression is an umbrella term for two fallacies already distinguished by Aristotle. One is the fallacy of generalizing in an inappropriate way from a particular instance to a universal generalization containing a ‘for all x’ quantification. The other is the secundum quid (‘in a certain respect’) fallacy of moving to a conclusion that is supposed to be a universal generalization containing a ‘for all x‘ quantification while overlooking qualifications that have to be added to the more limited kind of generalization expressed in the premise. It is shown that these two fallacies relate to two different kinds of generalization.

The classification of fallacious generalizations is based on a new theory of generalization that distinguishes three kinds of generalizations – the universal generalization of the ‘for all x’ type, used in classical deductive logic, the inductive generalization, based on probability, and the presumptive generalization, which is defeasible, and allows for exceptions to a general rule. The resulting classification goes beyond a logic-oriented analysis by taking into account how a respondent may oppose a potentially fallacious generalizing move by falsifying it. Using a dialectical interpretation of premise-conclusion complexes, the paper outline a richer concept of generalizing argument moves embedded in a communicational reconstruction of the strategic uses of such moves in which two parties take part in an orderly dialectical exchange of viewpoints.

abductive inference deceptive advertising default reasoning dialectical argumentation dialogue overlooking qualifications suppression of evidence 


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Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • Douglas Walton
    • 1
  1. 1.Department of PhilosophyUniversity of WinnipegWinnipegCanada

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