MODELING AND SIMULATION OF OPERATING SYSTEM BEHAVIOR Bernd Däne, Wolfgang Fengler, Falk Berger Ilmenau Technical University ABSTRACT This paper shows an attempt to model the behavior of Real Time Operating Systems. The model uses the discrete event paradigm and includes kernel functions as well as application tasks. Limited resources such as processing time and memory space are represented. Simulation delivers recorded data about task activity, kernel invocation and resource occupation. An example model and simulation results are demonstrated. KEY WORDS Model Development, Simulation Tools and Languages, Discrete Event Simulation.