1. William E. O'Neil Pre-Doctoral Candidate in Construction Management and Master of Computer Science Student, Univ. of Illinois, Urbana-Champaign, 205 N. Mathews Ave., Urbana, IL 61801 (corresponding author).
2. Dean of The Fu Foundation School of Engineering and Applied Science and Morris A. and Alma Schapiro Professor of Civil Engineering and Engineering Mechanics, Earth and Environmental Engineering, Columbia Univ., 510 S.W. Mudd Bldg., 500 W. 120th St., New York, NY 10027.
3. Visiting Assistant Professor, Dept. of Civil and Environmental Engineering, Construction Management and Information Technology, Univ. of Illinois, Urbana-Champaign, 205 N. Mathews Ave., Urbana, IL 61801.
4. Assistant Professor, Dept. of Civil and Environmental Engineering, Hole School of Construction Engineering, Univ. of Alberta, 3-009 Markin/CNRL Natural Resources Engineering Facility, Edmonton, AB T6G 2W2, Canada.