1. Assistant Professor, Dept. of Construction, Southern Illinois Univ.-Edwardsville, Edwardsville, IL 62026–1803; formerly, Ph.D. Candidate, Dept. of Civil and Environmental Engineering, Carnegie Mellon Univ., 5000 Forbes Ave., Pittsburgh, PA 15213.
2. Associate Professor, Dept. of Civil and Environmental Engineering, Carnegie Mellon Univ., 5000 Forbes Ave., Pittsburgh, PA 15213.
3. Professor and Head, Dept. of Civil and Environmental Engineering, Carnegie Mellon Univ., 5000 Forbes Ave., Pittsburgh, PA 15213.