Development of the school system refers to the implementation of all elements of school to go to the same goal is the quality of the students assigned to the school's vision.
Development of a system of schools means an operation in every element of the school, to the same goal: the quality of the students according to the school's vision.
the development of the School system means that the operation of all components of the school to go to the same target is in quality of the students in accordance with the school's vision.