„In tracked education systems, teachers appear to provide more equal support and caring to low and high achievers and to students from different socioeconomic backgrounds within the same school. Moreover, schools with disadvantaged student populations seem to develop an especially supportive learning environment.“
Dr. Svenja Vieluf u. a., „Who has a good relationship with the teachers? A comparison of comprehensive education systems with education systems using between-school tracking“ in „Oxford Review of Education“ (2015), Vol. 41, No. 1, S. 19