This title contains 50 papers presented at the Fourth Forensic Engineering Congress, held in Cleveland, Ohio from October 6-9, 2006. The papers included cover a wide array of subjects related to research, practice, and education, including, natural hazards, residential investigations, structures, geotechnics and geo-environment, performance of transportation facilities, historical cases, vibrations, nondestructive evaluation and repair, forensics and design practices, and tunnels and culverts.