In this paper, E. Esch and C. Zähner argue that the learners themselves are the key agents in the construction of new language learning environments. Learners differ in their ability to import new elements – such as ICTs – into their model of what constitutes an appropriate language learning environment. It is argued that accessibility, autonomy, ‘reflectivity’ and interactivity are conditions which must be met if ICTs are to become truly relevant to language learners. The way these principles have been guiding the development of the network-based language learning environment installed by the Language Centre of the University of Cambridge is described.