The goal of this paper is to introduce an emerging theoretical lens and strand of research in the field of language teacher education, that of threshold concepts (TCs). We do so by a) defining and explaining the construct of TCs itself, b) systematically reviewing the small body of literature that has explicitly used a TC lens to research language…

Since 1978, basic research on bilingual education in Mexico has prevailed, especially related to Indian languages. Action research has also been more fruitful than in the past. The few objective evaluations conducted have been notable for the publication of a wide range of results. (Author/BW)