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Content and Language Integrated Learning (CLIL) is ‘a dual-focused educational approach in which an additional language is used for the learning and teaching of both content and language’ (Coyle, Hood & Marsh, 2010: 1). It represents a model of bilingual education which, broadly speaking, involves some use of two (or more) languages of instruction in connection with teaching courses other than language per se .
Wei et al. (2015) studied this question.