The European Community on Computational Methods in Applied Science (ECCOMAS) has been created with the aim of providing a co-ordination of international scientific conferences and other activities in the field of computational methods in applied sciences. The main objective of the joint conferences on computational fluid dynamics and numerical methods in engineering is to provide a common forum for the presentation and discussion of scientific computing applied to engineering sciences. Equal emphasis is to be given to basic methodologies, scientific developments and industrial applications. These conferences are presented in three volumes. Volume one, "Computational Fluid Dynamics '96", covers the proceedings of the Third ECCOMAS Conference on Computational Fluid Dynamics; Volume two, "Numerical Methods in Engineering '96", covers the proceedings of the second ECCOMAS Conference on Numerical Methods in Engineering; and Volume three, "Computational Methods in Applied Sciences '96", which presents invited lectures and special technical sessions of both the Third ECCOMAS Computational Fluid Dynamics Conference and the Second ECCOMAS Conference on Numerical Methods in Engineering.