1. Assistant Professor, Dept. of Construction Science, Texas A&M Univ., Francis Hall 333, College Station, TX 77843 (corresponding author).
2. Assistant Professor, Dept. of Civil Engineering, Ohio Univ., 114 Stocker Center, Athens, OH 45701-2927.
3. Assistant Professor, School of Planning, Design and Construction, Michigan State Univ., East Lansing, MI 48824.