1613 Copyright © 2010, IGI Global, distributing in print or electronic forms without written permission of IGI Global is prohibited. Chapter 8.4 Planning for Knowledge Cities in Ubiquitous Technology Spaces: Opportunities and Challenges Tschangho John Kim University of Illinois at Urbana-Champaign, USA AbstrAct Ubiquitous cities, or U-cities, are defned as places where public and private services can be deliv- ered and received anywhere and at anytime. The goal of this chapter is to identify the challenges and opportunities that arise in the development of strategic plans and policies that address the problems associated with rapid global urban population growth. This chapter focuses on the potential of recently developed information and communication technologies and on the utilization of these technologies in conjunction with emerg- ing pervasive ubiquitous geographic informa- tion techniques. It also discusses the challenges existing cities face in striving for intelligent and sustainable development as they move toward becoming ubiquitous cities. IntroductIon According to the United Nations Secretariat (United Nations, 2006), the world population will reach 8.2 billion by 2020 with 60.8% of this total expected to live in urban areas, requiring approximately 5,000 metropolitan areas with a population size of one million each. Currently, about 400 metropolitan areas with varying popula- tions accommodate the equivalent of about 1,400 urban areas with a population of one million each. Therefore, the world will need to build the equivalent of more than 3,500 metropolises with one million residents over the next 15 years or expand the existing metropolitan areas to accom- modate the 3.5 billion additional urban residents. Under these circumstances, strategic planning for sustainable and intelligent cities maximizing scarce urban resources will be a crucial task for urban scientists and planners. In the U.S. alone,