Practical and comprehensive seismic design methods for both shallow and deep foundations are not fully established as yet. The 1990s have seen the publication of a series of important papers on the seismic design of shallow foundations. However, several important gaps between theory and observation are yet to be bridged. In 1987, Dowrick could write that an authoritative rationale for the design of deep foundations did not exist. Progress has been made in the intervening years but substantial further work is required fully to establish seismic design methods both for shallow and deep foundations (e.g. Pappin 1991; Pender, 1996). It is, therefore, pleasing to state that EN1998-5:2004 provides one of the most comprehensive codes of practice for addressing seismic foundation design.