What Do Normative Approaches to Argumentation Stand to Gain from Rhetorical Insights?

This article appropriates Thomas Conley’s (1990) four classical positions on the nature and function of rhetoric, and assesses their relevance vis-à-vis three contemporary normative approaches to argumentation: the epistemological approach, pragma-dialectical theory, and informal logic. In each case, the room for the integration of rhetorical insights into argument evaluation is found to be restricted by dialectical and logico-epistemic norms endorsed in these approaches. Moreover, when rhetorical insights could fit the so restricted room, then the reliability and the specificity of such insights remain inversely related, with methodologically well-hardened knowledge of what persuades remaining too general. The trade-off between reliability and specificity of suasory knowledge, or so is our thesis, undermines the claim that rhetorical insights can presently inform the evaluation of natural language arguments in these three normative approaches.