„Urban Density“ - as a term of urban development - means the quantity and the quality of uses and of urban space available per person. „Urban Density“ increasingly becomes a tool for defining dimensions and criteria within the planning process in cities. In fact „Urban Density“ defines more than the relationship between built-up volumes and free space. It  expresses the quality of urban life based on the interaction of multifunctional urban activities.
Why is „Urban Density“ becoming more and more important within the field of urban design? How do we define criteria for an urban area to be densified? What density is appropriate or required for a neigbourhood? ... for a city quarter? ... for a metropolis?