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With a view to its use in relation to land consolidation programmes, we present an index for evaluation of land distributions that takes both plot size and plot shape into account and is designed for computer implementation in a geographical information system. The new Combined Size and Shape Index, is essentially the average of two estimates of tillage time per hectare, one based on plot size and the other on plot shape. It is envisaged that it will be useful for identification of areas in which land consolidation is most urgent, for evaluation of consolidation projects, and for consolidation project optimization. Examples are given of its application to forest and to arable land in Galicia (NW Spain).