Abstract
In this chapter, a software modeling language—Unified Modeling Language (UML)—is reviewed as a part of software intensive system development process. The review includes the evolution of UML by paying most attention on the diagrams included in versions 1.x and 2.x as well as on the formalism development used to specify the language. The review of UML shows the benefits and limitations of applying it within software development lifecycle, and identifies UML extension mechanisms and scenarios. As a result, UML improvement options are outlined. One of the improvement options is to strengthen UML specification by using mathematical topology which is based on formalism of Topological Functioning Model (TFM).
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