1. Assistant Professor, Dept. of Architectural Engineering, Pennsylvania State Univ., 224 Engineering Unit A, University Park, PA 16802.
2. Assistant Professor, Dept. of Construction, Southern Illinois Univ. Edwardsville, Engineering Bldg. 3075, 61 Circle Dr., Edwardsville, IL 62025.
3. Professor, Tishman Construction Management Program, Dept. of Civil and Environmental Engineering, Univ. of Michigan, 2350 Hayward St., Suite 2340 G.G. Brown Bldg., Ann Arbor, MI 48109 (corresponding author).