This study investigated whether and how improvement of learners' English language proficiency enables or constrains the development of mathematical proficiency. I used statistical methods to analyse the pre- and post-tests in order to compare the mathematics achievement of 45 learners with those from another class of 48. I analysed the classroom interaction in the mathematics class before and after the intervention in order to determine to what extent the improvement of English language enabled or constrained communication in the mathematics class. The findings were, firstly, that the improvement of learners' language proficiency, even though important for achievement in mathematics, may not be sufficient to impact on classroom interaction; and secondly, that any attempt to improve the language proficiency of learners with the aim of improving academic proficiency should be done in such a way as to develop concurrently both the basic interpersonal communicative skills (BICS) and the cognitive-academic lan...
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