1. Assistant Professor, Dept. of Construction Engineering and Management, King Fahd Univ. of Petroleum and Minerals, P.O. Box 346, Dhahran 31261, Saudi Arabia; formerly, Assistant Professor, Faculty of Engineering, Zagazig Univ.
2. Lecturer, Dept. of Construction Engineering and Management, King Fahd Univ. of Petroleum and Minerals, P.O. Box 346, Dhahran 31261, Saudi Arabia.