Uml Extensions for Modeling Real-time and Embedded Systems

The process of modeling and developing of real-time and embedded systems should be supported by suitable methods and notations. In the paper we examine different approaches for customizing standard modeling language UML to model such systems in object-oriented analysis and design. We propose the use of UML standard lightweight extensibility mechanisms (stereotypes) without changing the UML metamodel. Our approach allows joining advantages of extended sequence diagrams and timing diagrams with UML and provides traceability of a concept throughout system development. The examples illustrate our approach. Applying lightweight UML extension mechanism allows existing standard UML modeling tools to be used without any adaptations.