1. Assistant Professor, Dept. of Construction Management, Colorado State Univ., Fort Collins, CO 80523-1584 (corresponding author).
2. Graduate Student, Dept. of Construction Management, Colorado State Univ., Fort Collins, CO 80523-1584.
3. Assistant Professor, Dept. of Civil Engineering, George Mason Univ., Fairfax, VA 22030.
4. Assistant Professor, Dept. of Civil Engineering, California State Polytechnic Univ., Pomona, CA 91768.