This document is the third volume in the three-volume 2006 IBC Structural/Seismic Design Manual. It has been developed by the Structural Engineers Association of California (SEAOC) with funding provided by SEAOC. Its purpose is to provide guidance on the interpretation and use of the seismic requirements in the 2006 International Building Code (IBC), published by the International Code Council, Inc., and SEAOC's 2005 Recommended Lateral Force Requirements and Commentary (also called the Blue Book).