Recognizing that the need to exchange information has been one of the critical influences in urban design, the Twenty-First Colston Research Society (CRS) Conference explored a variety of topics in the area of communications, transportation, and the environment. These subjects were pursued from the British experience and most all the papers have specific relevance to either Greater London or Great Britain. Primarily the conference scrutinized the current concept of "city" by means of a theoretical systems analysis that was based on information flow. Also discussed were the future of urban planning, telecommunication, public transportation, and human interaction. A simulation model for use as a design tool by planners was presented. (MC)