Dealing with the concept of Public Administration is not an easy task. During Administrative law history, many authors have tried to reach a common point to identify the administrative phenomena; no one has been able to find a definitive result. This book is however an succinct attempt to appreciate core areas of Administrative Law such as: The Public Administration; Methods for granting powers to administrative bodies; Special nature and typology of administrative action;Sources of administrative law. Structure and characteristics; Regulations as specific source of administrative law; Corporative and institutional administration.