Guidelines are presented for achieving human factors inputs to the design of synthetic training systems. A method is developed for design and organization of training concepts and data supportive to the human factors specialist in deriving the functional specifications for the design of any complex training device. Three major sections are provided. The first of these presents an organized method for achieving human factors inputs to training system design. Another section presents concepts and data applicable to the design of training devices--visual simulation, platform simulation, vehicle control requirements, information processing requirements, measurement system design, adaptive training strategies, and deliberate departure from realism in design. Design support for each of these factors is articulated based on a review of the pertinent literature. Where design evidence is meager, the data gaps are identified. Research issues of high priority for human factors design are recommended. The third section contains a demonstration of the human factors design process for a complex training system. (Author/JY)