The authors explore why teachers are totally unprepared to accept in the classroom the various versions of diversity: ethnic, social, cultural. They argue that this is largely due to the way they have been trained and are called upon to educate. In Greek education, the value of homogeneity and the silencing of difference are two fixed axes on which national identity is built. The pedagogical consequence of this perception is everyday teaching practices that exclude anything that does not resemble the ideal average student.
Heterogeneity and school

References
Androussou A., Askouni N., (2004) Heterogeneity and school, in Keys and Objectives, YPEΠΘ/ Panep. Athens University.