1. Procurement and Contracts Senior Engineer, Six October Development and Investment Company (SODIC), Cairo/Alexandria Rd., Km 38, Sheikh Zayed City, Giza 12588, Egypt; Postgraduate Sudent, Faculty of Engineering Cairo Univ., Giza 12613, Egypt (corresponding author).
2. Professor, Faculty of Engineering, Cairo Univ., Giza 12613, Egypt.
3. Lecturer of Construction Contracts and Claims, Faculty of Engineering, and Managing Director of DAR for Engineering Contracts, Cairo Univ., Cairo 11431, Egypt.