1. C. T. Wells Professor of Project Management, Dept. of Civil, Architectural and Environmental Engineering, Univ. of Texas at Austin, 1 University Station C1752, Austin, TX 78712.
2. Associate Professor, Dept. of Civil, Architectural and Environmental Engineering, Univ. of Texas at Austin, 1 University Station C1752, Austin, TX 78712.
3. Postdoctoral Research Associate, Dept. of Civil, Construction and Environmental Engineering, Iowa State Univ., 394 Town Engineering, Ames, IA 50011 (corresponding author).