This article discusses the use of English as a lingua franca (ELF) by engineering students and its effectiveness in content courses at a technical university, reporting the preliminary results of part of a study that investigates authentic and high-stakes speech events at a Swedish technical university. The main aim of my research is to find out what kind of divergence from standard morphosyntactic forms of English if any leads to disturbance, i.e. breakdown, in ELF speech.