1. Professor and Chair, Construction Engineering and Management, Univ. of Wisconsin-Madison, 2320 Engineering Hall, 1415 Engineering Dr., Madison, WI 53706 (corresponding author).
2. Graduate Student, Dept. of Civil and Environmental Engineering, Univ. of Wisconsin-Madison, 2256 Engineering Hall, 1415 Engineering Dr., Madison, WI 53706.
3. Professor, Dept. of Mathematics and Actuarial Science, American Univ. in Cairo, AUC Ave., P.O. Box 74, New Cairo 11835, Egypt; Visiting Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Wisconsin-Madison, 2256 Engineering Hall, 1415 Engineering Dr., Madison, WI 53706.
4. Dean, Division of Continuing Studies, Vice Provost for Lifelong Learning, Univ. of Wisconsin-Madison, 21 North Park St., 7th Floor, Madison, WI 53715.