1. Assistant Professor, Michigan State Univ., 552 West Circle Dr., East Lansing, MI 48824; formerly, Postdoctoral Fellow, Myers-Lawson School of Construction, Virginia Tech, Blacksburg, VA 24061-0188 (corresponding author).
2. Associate Professor and Assistant Director, Myers-Lawson School of Construction, Virginia Tech, Blacksburg, VA 24061-0188.
3. Professor and Director, Myers-Lawson School of Construction, Virginia Tech, Blacksburg, VA 24061-0188.
4. Assistant Professor, Dept. of Construction Science, Univ. of Texas at San Antonio, San Antonio, TX 78207.
5. Professor and Head, Dept. of Industrial and Systems Engineering, North Carolina A&T State Univ., Greensboro, NC 27411.