The article presents the conceptual groundwork for an understanding of the essentially improvisational dimension of human rationality. It aims to clarify how we should think about important concepts pertinent to central aspects of human practices, namely, the concepts of improvisation, normativity, habit, and freedom. In order to understand the sense in which human practices are essentially improvisational, it is first necessary to criticize misconceptions about improvisation as lack of preparation and creatio ex nihilo. Second, it is necessary to solve the (...) theoretical problems that derive from misunderstandings concerning the notions of normativity, habit, and freedom – misunderstandings that revolve around the idea that rationality is a form that is developed out of itself and thus works in a way similar to algorithms. One can only make sense of normativity, habit, and freedom if one understands that they all involve conflictual relationships with the world and with others, which in turn enables one to adequately take into account their constitutive connection to improvisation, properly understood. In outlining these conceptual connections, we want to prepare the foundations for an explanation of rational practices as improvisational practices. The article concludes by stating that human rational life is improvisatory because the conditions of human practice arise out of practice itself. (shrink)