Book excerpt: The 2002 issue of the Yearbook concerns the notion of reasonableness in philosohical, legal and economic domains. After going back over the main definition of the concept of reasonable in greek philosophy, the analysis carried out in this volume deals with the role played by the notion of reasonableness in practical philosophy and namely according to hermeneutical view of it. With regard to legal field, the notion of reasonableness is a core notion in constitutional law and it assumes specific meanings in private, criminal, international, and administrative law. Reasonableness turns out to be crucial with regard to many topics, such as interpretation of rights, balancing of fundamental rights, and interpretation of standards.