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The distinction between urban theory and planning theory is not intellectually viable. Reasons include (1) the historical roots and justification for planning, which depends on a vision of the city rather than simply a method of arriving at prescription; (2) the dependence of effective planning on its context, which means that planning activity needs to be rooted in an understanding of the field in which it is operating; and (3) the objective of planning as conscious creation of the just city, which requires a substantive normative framework.
Susan S. Fainstein (Mon,) studied this question.