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In the paper by L.U. Gokdere and M.A. Simaan (see ibid., vol. 44, p.688-95, 1997), a comparison is made between a passivity based controller and an input-output linearization controller. We point out that this comparison is not valid as the same trajectory was not used for both controllers. The original authors reply to this comment pointing out that there is experimental evidence demonstrating the benefits of the passivity-based controller developed for induction motors. These include closer tracking of the same mechanical trajectory, and less sensitivity to magnetic saturation, when compared with the input-output linearization controller.