„Tutoring is driven by competitive pressures in an increasingly globalised world. Many governments pay strong heed to rankings in cross-national assessments. […] Some governments in turn promote competition through public ranking of achievement by schools; and schools promote competition through public ranking of achievement by pupils.“
Univ.-Prof. Dr. Mark Bray, „Shadow Education: Comparative Perspectives on the Expansion and Implications of Private Supplementary Tutoring“ in „Procedia – Social and Behavioral Sciences“ 77 (2013) S. 416