1. Ph.D. Student, School of Civil and Construction Engineering, Oregon State Univ., 101 Kearney Hall, Corvallis, OR 97331 (corresponding author).
2. Assistant Professor, Dept. of Construction Management, Univ. of Washington, 120 Architecture Hall, Campus Box 351610, Seattle, WA 98195.
3. Ph.D. Student, School of Civil and Construction Engineering, Oregon State Univ., 101 Kearney Hall, Corvallis, OR 97331.
4. Professor, School of Civil and Construction Engineering, Oregon State Univ., 101 Kearney Hall, Corvallis, OR 97331.