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.