PARAGON : A Paradigm for theSpeci cation , Veri cation and

| The PARAGON toolset provides an environment for the modular and hierarchical design of resource-bound, real-time systems. It ooers well-integrated graphical and textual speciication languages with formal semantics. Both languages are based on the Algebra of Communicating Shared Resources (ACSR), a process algebra with explicit notions of time, resources and priority. The integration of the three notions widens the applicability of the PARAGON formalisms to embedded systems, control systems, and fault-tolerant systems where run-time resource requirements must be considered during the design phase. To facilitate the design of complex systems, PARAGON allows a designer to describe a system incrementally through reenement steps that preserve system properties. To increase dependentability of system models, PARAGON ooers three types of analysis: automated veriication of system requirements , interactive simulation, and testing. In this paper, we demonstrate the design methodology that PARAGON ooers through examples.