1. Professor, Dept. of Civil and Environmental Engineering, 213 McLaughlin Hall, Univ. of California, Berkeley, CA 94720.
2. Assistant Professor, Project Management Program, Dept. of Management Science, Monroe Hall 403, George Washington Univ., Washington, DC 20052.
3. Graduate Student, Dept. of Civil and Environmental Engineering, Univ. of California, Berkeley, CA 94720.