In this paper we describe the implementation and management of a flexible model for multi-level distance learning-based teacher training. The model was implemented to introduce curricular and pedagogical aspects of teaching logic programming, to high-school computer science leading-teachers, in the framework of an in-service course. Although the advantages of preparing a unique training program for each teacher and initiating peer collaboration were clearly demonstrated during the course, we also noticed several difficulties that may be associated with the decentralization of the course and the exposure and accessibility of the web-based communication.