Speech Acts and Reasonableness in Pragma-Dialectics

We begin by explaining why formulating the pragma-dialectical (henceforth PD) account of argumentation in terms of some central notions of speech act theory, as Frans van Eemeren and Ton van Haaften (Argumentation 37:341–376, 2023) propose, fails. We go on to suggest that this failure reveals a deeper problem with the theory, one that makes it impossible for it to meet what van Eemeren and van Haaften recognize as the most important requirement for it. They say “The crucial problem in the study of argumentation therefore is how maintaining reasonableness in argumentative discourse can lead to effective convincingness.” (Argumentation 37:341–376, 2023, p. 3) But on a proper understanding of what it is for an argument to be reasonable, this circle cannot be squared, since reasonableness and convincingness vary independently. A reasonable argument does not always convince, nor is one that does always reasonable. If this is, indeed, the crucial problem for pragma-dialectics, we will argue that it cannot be solved in the way that PD proposes.