Although progressing very well over the last years, the design criteria for bored and auger piles are still not fully under control and in acceptable synergism with the real pile foundation behaviour. Although there has been a lot of research in the past years; worldwide on;deep foundation engineering, the strong and competitive market has absolutely favorized the ingenuity of the contractor s world. A striking example of this is of such developments;linked;ideas on energy piles; one of the key topics in this book. This book presents the;current status;of;screw or bore pile-soil interaction findings and developments.