نظریه های برنامه ریزی و زمینه های شکل دهنده ی آن ها از اوایل قرن بیستم تا اواسط دهه١٩٧٠

Present paper aims at examination of planning theory until mid 1970s and the contexts causing them.
 Selecting 1970 decade is for this reason that the point of time is a mediate between two distinct types of
 planning theories: theories of planning until 1970 (mainly positivist), and communicative planning
 theories (post positivist) that are characteristics of recent decades. Facing the questions about why
 planning theories are forming and how they are evolving, this paper, learnt from philosophers of science,
 presuppose that all theories are created to provide an explanation for a theoretical tension resulting from a
 problematic situation. Planning theories are affected from external factors and contexts. They are not
 context-less (the condition dominant in natural science ), but they are made by individuals within the
 social, economic and political systems of a real world. Planning theorists try to explain, justify and
 interpret planning in their own social context. In other words, theory and theorizer are constrained by
 planning practice and complex social, economic, political and epistemological system within which they
 operate. Changes in planning reality and their contexts probably will be reflected in theorizers’ perceptions
 of their profession and nature of theory, social processes and changes. So, for understanding planning
 theories and their evolutions, we must know that the economic, social, political and epistemological forces
 produce them. This paper tries to provide a brief description of planning theories and different factors
 forming them with focusing on three distinct periods. After defining some basic concepts, the paper
 presents a typology of theories within urban and regional planning. Then, the paper bases its examination
 on a specific type of theories discussed, namely planning theory or theory of planning. In later stage,
 different period of planning theorizing is presented according to the views of main planning scholars: there
 are three main period of planning theory until mid 1970s, as follows: a) first period from beginning of
 twenty century to the end of 1950s which is well known as a master planning or blueprint period. In this
 period there is not a planning theory. Second period starts from the end of 1950 to the end1960. This
 period can be named the era of dominance of systematic planning or procedural planning theory. The third
 period starts from early 1970s. In this period, there is not any dominant planning theory but there are
 several planning theories such as incremental planning, advocacy planning, mixed scanning, political
 economy and transactive planning. Within each planning theorizing periods, different planning theories
 and factors significant on forming them are discussed. Before doing conclusion, a brief analytical report of
 evolution of planning theory in recent decades are presented. Examination indicates that planning field in
 recent decades is dominated by communicative planning theories and post-positive theories from 1980 on.
 Examination of this period, also, demonstrates that external conditions such as transformation of social
 theories and epistemological changes originated from knowledge field outside of planning are significant
 in creation of post positive theories of planning. Theory of communicative action as a social theory from
 Habermas is the most important framework theory for planning theorists. In final section, paper concludes
 on different contextual forces which are vital in creation of planning theories.

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