The book details the use of UML at all stages of the database design process: modeling precedents and objects of activity, determining requirements, analysis and preliminary design, detailed design, deployment. The non-standard presentation method chosen by the authors allows the reader to become one of the participants in the real project considered throughout the book, and, together with the database development team, successfully solve the problems that arise during the work on this project. The book is designed for readers with various levels of training who are interested in modeling and designing applications using UML.