Abstract

Deanna Kuhn's theory of informal argumentation (1991) evaluates arguments according to a theory/evidence model where subjects first articulate a theory and then must provide critical testing of alternatives on the basis of evidence. Using this model, Kuhn reports that many subjects fail to supply adequate evidence for their 'theories' and are often unable or unwilling to generate alternatives. In this paper an account of practical reasoning is provided that suggests an alternate interpretation for Kuhn's subjects' poor perfonnance. It is argued that treating practical arguments as failed theoretical justifications causes Kuhn to misrepresent the contribution of many of her subjects' arguments