The applications of network technology to pre-service and in-service teacher training are wide in scope but may nevertheless be grouped into two broad categories: the network as a source of assistance (or self-help) for teachers during the classroom transfer of knowledge which they have gained on an on-site training course; and the network as an environment where the training process actually takes place. This article describes the study of a mixed on-site/on-line approach adopted for a training course called EDIT (EDucating with Internet and Telematics); the topic of the course itself was the use of the Internet to support teaching. The distinguishing feature of the approach used is the alternation between complementary on-site training and on-line activities.