Urban design, involved at the end of 1960's is regarded as a phenomenon of Postmodernism and a critique for the modernist architecture and urban planning. People of different backgrounds have different concerns and perceptions on the physical urban environment, thus have different images of the city. These images create diversity in urban spaces and multiple faces of a city. This diversity is then interpreted in building the urban environment with multiple identities. In this master thesis, a multi-actor urban design approach is discussed via an Italian case. It addresses a mediating design method to tackle the growing complexity in urban networks.