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The results of dynamic seat testing at four different test facilities with different test devices are presented. An acceleration-type sled, two deceleration-type sleds, and a drop tower were used in this evaluation. Repeatability between test facilities is discussed. Comparisons of the results obtained from the four test facilities, including pulse shapes, acceleration levels, measured injury criteria, and structural loads, are made. The findings of this program address the question of whether or not different test facilities and test devices produce comparable test and certification results.