Fundamentals of system simulation presents system simulation fundamentals and principles, theories and practices, in a simplified approach, for applications in a wide range of interests. The book gives a full and explicit account of basic terms and concepts; theories and practices; solved examples and demonstrations. The main topics practically and generally useful in system simulation applications are covered in the book; including: system simulation procedures; analog and digital approaches to system simulations; computer simulations and major soft wares; a full account of main probability distribution functions for applications in system simulations; random variable generation for known probability distributions; simulation of random events and stochastic phenomena; differential and difference equation simulations; difference operators and z-transforms applications; solved examples and demonstrations of real life system simulations.