„Recent research based on 8875 children in the Millennium Cohort Study showed that 25.8 % of children in Year 2 were set for literacy and mathematics and a further 11.2 % of children were set for mathematics or literacy alone.“
Univ.-Prof. Dr. Susan Hallam u.a., „The incidence and make up of ability grouped sets in the UK primary school“. In: „Research Papers in Education“ (2012), S. 1