Argumentation is essential to human reasoning. Chapter 4 explores the nature of argumentation and distinguishes among consensual, disputational, and deliberative forms. The chapter focuses on critical discussions as a type of deliberation and introduces the idea of wise deliberative spaces, grounded in psychological research on wisdom. These spaces promote truth-seeking and moral inquiry. They employ wise discourse practices that support cognitive diversity, face protection, and reduced status hierarchies – through using ground rules, facilitators, active listening, critical questioning, and integrative argumentation. The chapter then explores examples relating to classroom discourse, informal dialogue across divides, deliberative democracy, deliberative polling, and tribal societies. It concludes by discussing institutional wisdom – how institutions like investigative journalism and constitutional democracy can support wise deliberation – though both face mounting challenges today.Argumentation is essential to human reasoning. Chapter 4 explores the nature of argumentation and distinguishes among consensual, disputational, and deliberative forms. The chapter focuses on critical discussions as a type of deliberation and introduces the idea of wise deliberative spaces, grounded in psychological research on wisdom. These spaces promote truth-seeking and moral inquiry. They employ wise discourse practices that support cognitive diversity, face protection, and reduced status hierarchies – through using ground rules, facilitators, active listening, critical questioning, and integrative argumentation. The chapter then explores examples relating to classroom discourse, informal dialogue across divides, deliberative democracy, deliberative polling, and tribal societies. It concludes by discussing institutional wisdom – how institutions like investigative journalism and constitutional democracy can support wise deliberation – though both face mounting challenges today.