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This article concentrates on the reasons of failure of development plans in the third world in recent decades, and among them the emphsis is put on theoretical reasons. The main answer is that every failure or success that has been experienced in the area of planning development in these countries to a great extent has something to do with social sciences, particulary sociology.
In the writer's view, when the planners of development after their initial failures moved toward a new defenition of development and understanding its varios social and cultural dimension they took a step in right direction.
The early steps which become possible through sociological views,
later were followed by other steps but never reach the final point.
The last step according to this article is to place economic institution and economic behaviors in the social system as a whole - that is society. This aim will be possible through adapting a holistic position, and considering that economic behavior in addition to being a social structure and economic institution is a social institution, so it will provide proper situation to able sociologists to interfere actively and directly with planning developments.