This book provides the reader with a balanced and integrated presentation of the modelling and simulation activity for both Discrete Event Dynamic Systems (DEDS) and Continuous Time Dynamic Systems (CYDS). Within the context of foundation material the authors establish a clear distinction between the activity of modelling and that of simulation and carefully maintain this distinction throughout. A novel project-oriented approach for developing the modelling and simulation methodology is given thereby providing a solid basis for demonstrating the dependency of model structure and granularity on project goals. Comprehensive presentation of the verification and validation activities within the modelling and simulation context is also shown. This book is oriented to students taking a first course in modelling and simulation at either senior undergraduate and junior graduate levels. A CD is included containing OpenDesire and GPSS software.