1. Project Controls Engineer, Fluor Canada, Ltd., 700–1075 West Georgia St., Vancouver BC, Canada V6E 4M7. E-mail: howard.nie@fluor.com
2. Assistant Professor, Civil Engineering Dept., 6250 Applied Science Ln., Univ. of British Columbia, Vancouver BC, Canada V6T 1Z4. E-mail: ssf@civil.ubc.ca
3. Associate Professor, Civil Engineering Dept., 6250 Applied Science Ln., Univ. of British Columbia, Vancouver, BC, Canada V6T 1Z4. E-mail: tfroese@civil.ubc.ca