1. Research Assistant, System Engineering Dept., King Fahd Univ. of Petroleum & Minerals, Dhahran 31261, Saudi Arabia.
2. Associate Professor, Construction Engineering and Management Dept., King Fahd Univ. of Petroleum & Minerals, P.O. Box 346, Dhahran 31261, Saudi Arabia (corresponding author).
3. Professor, System Engineering Dept., King Fahd Univ. of Petroleum & Minerals, Dhahran 31261, Saudi Arabia.