Drivers of evolution of training simulators

In many domains, applications have a lifetime of several years, and evolve with new technologies, changing requirements and user behavior. Simulators have been used for training for decades and have evolved in different directions. To learn how applications evolve over time, it is important to understand what stimulates changes. There can be factors in the world external to the application, e.g. human, organizational and technological factors that stimulate changes and there can be factors internal to a software system, such as its structure and complexities. This paper investigates how new work, fidelity and evaluations can contribute to the understanding of evolution of simulators.