Intended, implemented and experiential null curriculum

Curriculum development is one of the main parts of learning and teaching process in education.
Curriculum development includes overt, hidden, and null curriculum. In fact, null curriculum refers to the omitted
and neglected parts of a curriculum. This paper presents null curriculum as consisting of intended, implemented, and
experiential parts. The intended null curriculum is that authors of school textbooks or politicians exclude some parts
of the content and curriculum because of its incongruence with the needs of students and society. The implemented
null curriculum is that teachers ignore or exclude some parts of the content and curriculum that is not fit to students'
needs and interests in the course of instruction. In experiential null curriculum, students neglect or pay little attention
to some contents because these materials do not relate to their life or it is incongruous with their needs. The main
purpose of this research is to present theoretical views about three kinds of intended, implemented and experiential
null curriculum. Finally suggest some ways to avoid content loss in curriculum planning or implementing.