Improving the feedback quality of a computer-based system for pronunciation training requires rather detailed and precise knowledge about the place and the nature of actual mispronunciations in a student’s utterance. To be able to provide this kind of information, components for the automatic localisation and correction of pronunciation errors have been developed. This work was part of a project aimed at integrating state-of-the-art speech recognition technology into a pronunciation training environment for adult, intermediate level learners. Although the technologies described here are in principle valid for any language pairs, the current system focuses on Italian and German learners of English.