O.C. Zienkiewicz, CBE, FRS UNESCO Professor of Numerical Methods in Engineering International Centre for Numerical Methods in Engineering, Barcelona Previously Director of the Institute for Numerical Methods in Engineering University ofWales, Swansea R.L. Taylor J.Z. Zhu Professor in the Graduate School Senior Scientist Department o f Civil and Environmental Engineering ESI US R & D Inc. University of California at Berkeley 5850Waterloo Road, Suite 140 Berkeley, California Columbia, Maryland f Civil and Environmental Engineering ESI US R & D Inc. University of California at Berkeley 5850Waterloo Road, Suite 140 Berkeley, California Columbia, Maryland