MEZ is a longitudinal study which follows two parallel cohorts in classes 7 and 9 through to the end of classes 9 and 11 respectively. Data collection is carried out in four phases. The initial sample will include approximately 1,800 students with German-Turkish, German-Russian, and monolingual German language backgrounds from public schools in several federal states (Bundesländer).
Data collection includes the contextual, personal, and linguistic factors that are relevant for the development of multilingualism. This includes the assessment of participants’ receptive skills (reading and listening) and productive skills (written and oral) in academic language (Bildungssprache), as well as in the heritage languages Russian and Turkish and, where applicable, in the school-taught foreign languages English, French, and Russian. Detailed linguistic analyses on the transfer between languages and on phono-prosodical language production will be carried out on selected subsamples.