1. Associate Professor, Dept. of Civil Engineering, Univ. of New Mexico, Albuquerque, NM 87131 (corresponding author).
2. Assistant Professor, Dept. of Construction Management, Univ. of Washington, Seattle, WA 98105.
3. Ph.D. Student, Construction Systems Management Program, Ohio State Univ., 590 Woody Hayes Dr., Columbus, OH 43210; formerly, Graduate Research Assistant, Dept. of Civil Engineering, Univ. of New Mexico, Albuquerque, NM 87131.