Critics of urban and regional planning argue that planning is geared mainly to regulate and manage the small, incremental types of change typical of most cities, towns, and regions. Indeed, most of the academic and professional literature for the guidance of planners is targeted to the more commonplace situations. But what of unexpected, large-scale changes? Can planning also then be of use? Will the theories and kit of tools available to urban, regional, or national planners be effective in a major crisis?