„Students with lower achievement levels […] can benefit from selective schooling because when they are grouped with other less achieving students, their frame-of-reference contains, on average, less able peers. Hence, their ASC (Anm.: ASC = academic self-concept) will be more positive than if they had been placed in a classroom with high achieving students.
Univ.-Prof. Dr. Benjamin Nagengast u. a., „Big fish in little ponds aspire more“ (2012), S. 6