The development of fully or partially online training, as well as the provision of digital learning materials for students, requires the development of systems that provide students with innovative services tailored to their needs. We are interested in students who perform all or part of their course in a foreign language and who face difficulties due to language understanding. Our goal is to provide them, on demand, online and in their native language, with a document similar to the one that troubles them. In this paper we present the needs analysis phase, related to the engineering process of the online service.