A genuine need existed for an updated foundation engineering handbook that incorporates, in addition to classical principles of foundation designs, significant contributions made to the art of foundation design by practitioners and researchers during the last two decades. Of special significance in this regard is the knowledge of (1) innovative in situ testing and site improvement techniques that have evolved recently; (2) costeffective design methods that make use of geogrids for mechanically stabilized earth retaining structures; (3) concepts involved in ground deformation modeling using finite elements; and (4) latest modifications in the ACI codes applicable to structural design of foundations. This handbook largely fulfills the above needs, since the editor and the contributors have focused on discussing the state of the art of theoretical and applied foundation engineering and concrete design in a concise and simple fashion.