The psychology of reasoning and argumentation studies how people reason and persuade others using language. Influenced by analytic philosophy, much early work focused on the degree to which verbal reasoning is captured by or diverges from classical deductive logic. From this viewpoint, human thinking can seem prone to substantial and systematic bias. Since 1994, verbal reasoning has been set in the context of uncertain, common-sense reasoning rather than deduction, and reasoning has been seen as continuous with the social challenge of real-world argumentation. From this perspective, the human ability to reason and argue with words is better considered not as flawed logical reasoning, but as often highly competent reasoning and persuasion in an uncertain and contested world.