This book offers a comparative introduction, by editors and native authors, to the most important aspects of administrative law in various EU Member States (Belgium, France, Germany, the Netherlands, the United Kingdom), at the level of the EU and in the United States of America. It aspires to contribute to the 'transboundary' understanding of different regimes related to actions and decisions of the administration. For the purpose of the use of this book in education, research and legal practice, the contributions to the book are all based on one and the same format, thus making it more accessible for its readers. The main items of the format are. . What is administrative law? . Who is administrating? . Which instruments are available to the administration? . Which (formal) rules/principles (written or unwritten) govern administrative actions? . Access to (administrative) courts against administrative actions/decisions. . Recent and future developments and conclusions. The final chapter offers comparative remarks by the editors.