This article illustrates the value of large-scale impact evaluations with counterfactual components. It begins by exploring the limitations of small-scale impact studies, which do not allow reliable inference to a wider population or which do not use valid comparison groups. The paper then describes the design features of a recent large-scale…

There is growing evidence of systematic underachievement of South African primary school learners in reading in English as the first additional language. There is a small but growing literature that provides insights, that is, causes, patterns and prevalence, into this phenomenon. Through a secondary analysis of a spelling component of a literacy…