Abstract
Development of the modern farm tractor has settled down into the detailed improvement of a single form that completely dominates production throughout the world, with the exception of the U.S.S.R. The essential tasks that the tractor must perform are described, together with the technical requirements imposed by the agricultural environment. It is shown that in the future very little real improvement in performance can be obtained without a radical change of form. Such a change only occurs when new performance standards are required and new technological possibilities are available. The likelihood of such a change is discussed.

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