1. Prof., Dept. of Civ. and Envir. Engrg., Univ. of California, Berkeley, CA 94720. E-mail: ibbs@ce.berkeley.edu
2. Asst. Proj. Mgr., Saylor Consulting Group, 12 Geary St., Seventh Floor, San Francisco, CA 94108. E-mail: clarence _wong@hotmail.com
3. Asst. Prof., Proj. Mgmt. Program, Dept. of Mgmt. Sci., The George Washington Univ., Monroe Hall 403, Washington, DC 20052. E-mail: kwak@gwu.edu