Abstract
This corpus demonstration introduces the recently created longitudinal corpus of young learners of Italian, German and English, called LEONIDE (Glaznieks et al. 2022). The corpus contains 2,512 texts from 163 pupils, who participated in the project “One school, many languages” conducted in eight schools in the multilingual Italian province of South Tyrol (Engel & Stopfner 2018). The aim of the project was to document the development of the pupils’ plurilingual competences by collecting oral and written language samples in three languages, to capture a holistic view of their individual linguistic repertoire.