Slums and informal settlements are a major source of social and economic problems in the developing world. They lack the basic services and infrastructure, causing disease and vulnerable to natural disaster. Slum clearance often takes the form of urban renewal projects. The paper main constrain is the insufficiency of slum upgrading strategy This paper aims to focus on the key factors that contribute to the success of formulation and implementation of slums upgrading. The paper methodology depends on the inductive method and the descriptive approach to explain some scientific concepts to clarify the information that will serve the paper problem. In addition to enabling the analytical method to explain and analyze some examples to formulate a strategy that is useful for application on the case study, reaching the results and establishing a theoretical and practical framework that can be applied on further studies. Upgrading projects should be built upon the understanding of the prevailing norms and beliefs in the targeted community. this can be accomplished through out conducting situation analysis of the communities in which they will operate. This includes ensuring public participation to share their voices and their needs, concerns, and interests are met. Community upgrading projects must gain support from community members and create partnerships with stakeholders for successful outcomes in addition to the significance of political commitment and continuous monitoring as shown in the case study in Egypt which emphasizes the need to address socioeconomic disparities and uplift marginalized populations with sustainable solutions.