“…Although the systems provided well accepted features for training task setup, control and performance feedback, problems with the efficiency of training that could be accomplished with the systems were observed (Puig and Gill, 1975;and Brown, Waag and Eddowes, 1975). The design of these systems was based on concepts developed for feasibility demonstration only (Charles and Johnson, 1971;Charles, Johnson and Swink, 1972;and Charles, Johnson and Swink, 1973).…”