  It is well known that the complex system operation requires the use of new
scientific tools and computer simulation. This paper presents a modular
approach for modeling and analysis of the complex systems (in communication or
transport systems area) using Hybrid Petri nets. The performance evaluation of
the hybrid model is made by a simulation methodology that allows building up
various functioning scenarios. A Decision Support System based on the above
mentioned methodologies of modeling and analysis will be designed for
performance evaluation and time optimization of large scale communication
and/or transport systems.
