Systems Engineering transforms an operational need into a final product. The Systems Engineering approach is the discipline used in the design of a product, the development process and the evaluation of the final product. A Systems Engineer coordinates all the components of the system which includes the Hardware, Software, Modeling, Interface, Human Factors, Security, Logistics and Safety. The coordination of each component is described, during the product design phase, development process phase and performance evaluation phase of the program, from a Department of Defense perspective. Specific stories are provided with the need of using a Systems Engineering approach, when designing and developing a product. The second half of the book uses the Systems Engineering approach and applies it to the design and development of a flight simulator. Each of the flight simulator components is specifically described in each design and development phase, including the evaluation of the flight simulator tactical environment.