This thesis reports the findings of three qualitative studies which were carried out in EFL classes at the University of Duisburg-Essen, Germany between 2001 and 2003. All three groups used various combinations of communication technologies such as e-mail, web-based message boards and videoconferencing in order to engage in on-line exchanges with different partner classes in Ireland and the USA. The research was aimed at establishing, firstly, how such virtual intercultural contact can contribute to the development of intercultural communicative competence, and secondly, what skills and knowledge both students and teachers need in order to engage successfully in this complex on-line learning activity. The research revealed that the success of such exchanges often depends on their appropriate integration into the language classroom and that it is necessary to reassess the role of the teacher in telecollaborative exchanges.