1. Assistant Professor, Division of Construction Engineering and Management, School of Civil Engineering, Purdue Univ., 550 Stadium Mall Dr., West Lafayette, IN 47907 (corresponding author).
2. Associate Professor. Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana Champaign, 3127 NCEL, 205 N. Mathews Ave., Urbana, IL 61801.
3. Assistant Professor, Dept. of Construction Management, Univ. of Washington, Seattle, WA, 98195.