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This tutorial has been written by R. G. Dyson, E. Thanassoulis and A. Boussofiane and adapted from the ‘Data Envelopment Analysis’ in Tutorial Papers in Operational Research, L.C.Hendry and R.W.Eglese eds. Operational Research Society, 1990, reproduced by permission of the Operational Research Society, UK. No part of this tutorial may be reproduced in any form without the express permission of the authors and the Operational Research Society, UK.