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The original design-performance evaluation method of tracks and tracklaying vehicles, proposed by this writer during the WW II, was further developed and enhanced with new experience gained by many researchers. The method is based on the approximation of track action by a number of appropriate wheel actions. It is mathematically simple, and practically unique encompassing detailed track and road wheel geometry, wheel spacing, loads and load distribution together with regular soil strength parameters. It conforms methodologically with evaluation of pneumatic tires and rigid wheels, previously published in a series of SAE papers. The said papers and the present one form a concise engineering outline of Terramechanics for off-road locomotion.