1. Senior Contracts Engineer, Six October Development and Investment Company, Cairo/Alexandria Rd., Km 38, Sheikh Zayed City, Giza 12588, Egypt; Post Graduate Student, Faculty of Engineering, Cairo Univ., Giza 12613, Egypt (corresponding author).
2. Professor, Faculty of Engineering, Cairo Univ., Giza 12613, Egypt.
3. Lecturer, Construction Contracts and Claims, Faculty of Engineering, Cairo Univ., Giza 12613, Egypt; Managing Director, DAR for Engineering Contracts, 14 St. 218, Degla, Maadi, Cairo 11431, Egypt.