The book is intended for participants in the e-government project who seek a deeper understanding of the issues involved in this broad interdisciplinary project. The ambitious goal set by the authors is to present the symbiosis between the legal regulation of administrative activity, the administrative management technologies established in practice, and the information and communication technology tools for their support with the processing of information entirely in electronic form. The book emphasizes the role of semantic interoperability, but the authors leave the full presentation of this interesting and rather specific topic for their future work on a new book.