This chapter argues that, if France has been the home of administrative courts, Austria has greatly contributed to the development of administrative law with regard to administrative procedure. Thanks to the Austrian Administrative Court, established in 1875, administrative law has been increasingly important in the regulation of public affairs. The chapter analyses the causes, development, and effects of these features. One main theme is, of course, the scope and purpose of judicial review of administrative action. In this respect, the chapter shows the growth of litigation and the liberal approach followed by the Court. Moreover, the role of the Court as lawmaker is examined in the light of the general principles of law that it developed. . Such principles included legality and procedural fairness, with particular regard to the right to a hearing and the duty to give reasons. Considered as a whole, they required public administrations to act reasonably rather than arbitrarily. Finally, it was judge-made law that constituted the basis for the codification of 1925.