This lecture introduces the concept of SDAU, a tool for urban planning that provides a vision of the city's development over the next 20 years. It covers the importance of SDAU in physical infrastructure planning, zoning, and land use. The lecture also discusses the challenges and benefits of the SDAU process, emphasizing the need for collaboration among stakeholders and the role of SDAU in securing investments for urban development. It explores the link between diagnosis, vision, and planning in urban development, highlighting the necessity of aligning these aspects for effective city planning. The lecture concludes by addressing the limitations of traditional urban planning methods and the potential for innovative approaches in shaping future cities.