Thinking about reasoning suffers from a failure of vision. Philosophers, social scientists, and others who discuss and analyze reasoning have a particular activity in view: reasoning to figure things out, solve problems, and reach judgments. But there is a different activity we engage in that we call reasoning. We reason in the course of living together, when we are responsive to those with whom we live and neither commanding nor deferring to them, neither manipulating nor ignoring them. Analysis of this second kind of activity has relied on the tools and frameworks developed to make sense of...