Abstract
Many methodologies for software modeling and design include some form of static and dynamic modeling to describe the structural and behavioral views respectively. Modeling and design of complex real-time software systems requires notations for describing concurrency, asynchronous event handling, communication between independent machines, timing properties. Dynamic modeling of real time systems using object-oriented methodologies requires extensions to the traditional state machine notations in order to convey the real-time system characteristics and constraints. This chapter proposes an object-oriented analysis and design methodology that augments the traditional UML (Unified Modeling Language) dynamic model with real-time extensions based on high-level parallel machines and communication notations from CRSM (Communicating Real-Time State Machines). An example of the proposed methodology is provided using a realistic example of an automated passenger train system.
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