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The main purpose of this study is exploring the roots and foundations of Schwab’s deliberative theory in curriculum. Therefore, after examining this theory in introduction, its foundations and origins were investigated. According to this, basic assumptions of this theory are practical and quasi practical arts, eclectic arts, commonplace and collective decision. Aristotle’s distinction between intellectual and moral virtues, knowledge categories and learning by doing are among the most important origins of Schwab’s’ theory. Distinction between theoretical and practical in Dewey’s ideas, his viewpoints on thinking along with pluralism are the essential foundations to evolution of Schwab’s theory. On the other hand, Haberma’s instrumental – communicative dualism, dialogue between commonplaces to achieve the goals and dialogue conditions and also decision making in micro level based on the communicative rationality, have some important implications for Schwab’s deliberative theory in curriculum.

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The emergence of re-conceptualism in the field of curriculum studies caused a large rotation of identity in this field. The book titled "understanding of curriculum" by William Pinar may be considered the most outstanding work in the field. In this book, movement which affected pre re-conceptualist, are introduced as the traditional type and it is believed the new curriculum discourses should be considered instead. That caused Joseph Schwab's theory is charged in the group of traditional pre re-conceptualist theories. This paper, by analyzing and identifying differences of Tyler's theory, Schwab's theory and re-conceptualism, plans to criticize this way of thinking and tries to introduce a new explanation of curriculum studies field as a practical one based on the role of Schwab's theory in the evolution of history of curriculum studies field.

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The purpose of this research is the effect of Schwab’s invitation to inquiry method and flipping problem solving on the academic function on Biology course of students of tenth grade with modifying critical thinking.This research’s method is semi – experimental with pre – test and post – test and control group.  Its statistical community includes female students of tenth grade of Tabriz city at the academic years of 2015-2016.Sample size consists of 69students of tenth grade were chosen by multistage cluster sampling methodGathering information tools include Ricketts critical thinking questionnaire and teacher made academic achievement test on Biology course.Data were analyze by covariance analysis method..The results indicated, critical thinking could be able act as a mediator in the effect of Schwab’s invitation to inquiry method on achievement of students werethought by Schwab’s invitation to inquiry method. In the other way it couldn’t act as a mediator in flipping problem solving