The present study took place in the Basque Autonomous Community (BAC), where there are two official languages, Basque, the minority language, and Spanish. The corpus was collected in a D model school, which is a model of Content Based Instruction (CBI) of total immersion for students whose first language is not Basque; and a maintenance model of bilingual education for students with Basque as their first language (Cenoz, 2015). In Model D, the language of instruction is Basque, with Spanish and English as subjects. According to the BAC curriculum (Eusko Jaurlaritza, 2023), the teaching and learning processes within school subjects constitute the most natural and common situations in which language is used, and thus advocate for the integration of language and content regardless of whether the language of instruction is a student's L1 or L2.
Inter- and multidisciplinarity is also advocated in the curriculum (Eusko Jaurlaritza, 2023), schools are increasingly pursuing multidisciplinary projects. In the school under analysis, a multidisciplinary project involving six subjects (mathematics, English, history, physical education, Basque and economics) and lasting 12 school days, is conducted every three months in the first year of the Humanities strand. This project follows the Project-Based Methodology (Bell, 2010), which requires students to work in groups of four. The overall goal of the project is to create empathy for the inhabitants of the continent of Africa, a continent that is both so close and yet so far away. In order to achieve this goal, each subject is expected to contribute to the shared theme from their perspectives.