For many children around the world, access to higher education and the labour market depends on becoming fluent in a second language. In South Africa, the majority of children do not speak English as their first language but are required to undertake their final school-leaving examinations in English. Most schools offer mother-tongue instruction in the first three grades of school and then transition to English as the language of instruction in the fourth grade. Some schools use English as the language of instruction from the first grade. In recent years a number of schools have changed their policy, thus creating within-school, cross-grade variation in the language of instruction received in the early grades. Using longitudinal data from the population of South African primary schools and a fixed-effects approach, the authors find that mother tongue instruction in the early grades significantly improves English acquisition, as measured in grades 4, 5 and 6.
