To lay a foundation for the design and effective use of low-cost, part-task and low-fidelity training devices, this report identifies dimensions of skill performance in terms of modern learning and behavior theory, and analyzes cognitive and motor skills as they relate to information processing. Cognitive processes discussed include task recognition; task comprehension; goal setting; planning performance; initiating, monitoring, and evaluating performance; stimulus encoding and elaboration; attentional processes; retention and retrieval of information; hierarchical schemata for discrimination and generalization; motivation; and skill integration and automatization. For motor skills, special attention is given to structural characteristics and movements; signal discrimination and generalization; roles of sensory modes and their interactions; and patterns of skill integration. Empirically-based concepts are used throughout to provide an operational means of manipulating variables during training, and examples are given of methods for empirically assessing the roles of various processes. Conclusions indicate that the analyses could readily be extrapolated to training technology in general and to the design of training devices in particular. Selected research topics illustrate what would be involved in the extrapolation. A 22-page reference list is provided. (Author/LMM)