1. Professor of Construction Projects Management, Structural Engineering Dept., Ain Shams Univ., Cairo 1151, Egypt.
2. Assistant Professor of Construction Projects Management, Structural Engineering Dept., Ain Shams Univ., Cairo 1151, Egypt; American Univ. in Cairo, Cairo, Egypt.
3. Ph.D. Candidate of Construction Projects Management, Structural Engineering Dept., Ain Shams Univ., Cairo 11431, Egypt (corresponding author).