The authors of this volume follow four interrelated themes. In the first section "Evolving Definitions - Changing Practices" the fundamental shifts in urban modeling practices are examined in relation to the new theoretical and computational advances in the field. The second section "Ecologic Processes and their Land Use Implications" provides current examples of ecological models that influence land use policy and planning. "Visualization, Representation and Communication" deals exclusively with the science and art of geographic data generation and representation techniques. Finally the section on "Socioeconomic Implications of Transportation and Land Use" examines the traditional domain of urban models from a sociological and environmental perspective and offers new insights on transportation planning.