Areas of Research: Multi-objective Optimization, Bi-level Programming,Inventory Management, Forecasting,Queuing Theory, Water Resources Management,Game Theory, Rough Optimization, Solid Waste Management. Author ORCID:https://orcid.org/0000-0002-8269-8822. WOS Researcher ID: AAJ-6528-2021, https://publons.com/researcher/4250510/hamiden-khalifa. Scopus Author ID: 7003439002,https://www.researchgate.net/profile/ Hamiden Abd El- Wahed Khalifa.