Urban sociology studies human groups in a territorial frame of reference. In this field, social organization is the major focus of inquiry, with an emphasis on the interplay between social and spatial organization and the ways in which changes in spatial organization affect social and psychological well being. A wide variety of interests are tied together by a common curiosity about the changing dynamics, determinants, and consequences of urban society's most characteristic form of settlement: the city.

Scholars recognized early that urbanization is accompanied by dramatic structural, cognitive, and behavioral changes. Classic sociologists (Durkheim, Weber, Toinnes, Marx) delineated the differences in institutional forms that seemed to accompany the dual processes of urbanization and industrialization as rural-agrarian societies were transformed into urban-industrial societies (see Table 1).

Several key questions that guide contemporary research are derived from this tradition: How are human communities organized? What forces produce revolutionary transformations...