The Unified Modeling Language (Unified Modeling Language, UML) is a graphical language for visualizing, specifying, constructing, and documenting systems, in which a large role is played by the software. With UML, you can develop a detailed plan to build systems containing not only its conceptual elements, such as the system functions and business processes, but also specific features such as classes written in specific programming languages, database schemas, and reusable components software. To the User Guide contains reference material, giving an idea of ​​how you can use the UML to solve a variety of problems of modeling. The book detailed, step-by-step describes how to develop software systems on the basis of language. The publication is addressed to readers who already have a basic understanding of object-oriented concepts (experience with the specific object-oriented languages ​​and techniques are not required, but is desirable). The first guide is intended for developers who are busy creating UML models. Nevertheless, the book will be useful to anyone who develops, produces, tests and produces light software systems.