The É-Calm project (Écriture scolaire et universitaire : Corpus, Analyses Linguistiques, Modélisations didactiques), funded by the French National Research Agency (ANR), used a corpus of student and student writing made available on a dedicated platform to characterise certain writing skills (orthography and textual coherence) and to gain a better understanding of the way in which teachers guide writing through their interventions on copies, in order to support rewriting from school to university. The main aim of the research was to make available in open access a large number of pieces of writing produced in a variety of learning contexts in order to analyse their linguistic and discursive features. The resulting collection gives visibility to the texts of writers at different levels of learning and writing proficiency.