The paper presents a historical overview of some characteristic differences between rhetoric and dialectic in the pre-modern tradition. In the light of this historical analysis, some current approaches to dialectic are characterized, with special attention to Ralph Johnson's concept of dialectical tier.

In this paper I explore Ralph Johnson's proposal that in addition to premises and conclusion every argument should have a dialectical tier in which the arguer addresses objections to the argument, and considers alternative positions. After exploring several reasons for thinking that Johnson's proposal is a good one, I then raise a number of objections against it and move ahead to respond to those objections, which I do by distinguishing making out a case for a conclusion from offering an argument (...) for it, and distinguishing supplementary arguments from one's main argument. I contend that it is not realistic to see arguers as having an obligation to respond to all objections and to address all alternative positions; we must somehow discriminate those which need and merit a reply from those which do not. (shrink)