1. Professor of Construction Management, Dept. of Civil and Environmental Engineering, Univ. of California, Berkeley, CA 94720; and, President, The Ibbs Consulting Group, Inc. E-mail: DRCWIbbs@aol.com
2. Ph.D. Candidate, Dept. of Civil and Environmental Engineering, Univ. of California, Berkeley, CA 94720. E-mail: duylong@berkeley.edu
3. Ph.D. Candidate, Dept. of Civil and Environmental Engineering, Univ. of California, Berkeley, CA 94720. E-mail: sooolee@berkeley.edu