Today the practice of urban design has forged a distinctive identity with applications at many different scales – ranging from the block or street scale to the scale of metropolitan and regional landscapes. Urban design interfaces many aspects of contemporary public policy – multiculturalism, healthy cities, environmental justice, economic development, climate change, energy conservations, protection of natural environments, sustainable development, community liveability, and the like. The field now comprises a core body of knowledge that enfolds a right history of ideas, paradigms, principles, tools, research and applications, enriched by electric influences from the humanities, and social and natural sciences.