Proceedings of the sixth International Conference on Composite Construction in Steel and Concrete held at the Devil's Thumb Ranch in Tabernash, Colorado, July 20-24, 2008. Sponsored by Engineering Conferences International; the Structural Engineering Institute of ASCE. This collection contains 63 technical papers representing the state-of-the-art in composite construction worldwide. Topics include: composite bridges, composite slabs, shear connectors, composite columns, innovative composite structural systems, fire and seismic resistance of composite structural systems, and practical applications. These papers will be valuable to structural engineers and allied professionals engaged in construction with steel and concrete composites.