MOSEP experiments with the use of electronic portfolios as a means of supporting both the adolescents and the teaching and counselling staff working with young learners during transition phases. A strong European partnership from Austria, Bulgaria, France, Germany, Lithuania, Poland and the UK is working closely with a network of experts across Europe to produce an e-portfolio toolkit specifically designed for initial and inservice teacher trainers and vocational counsellors. This toolkit will include an e-portfolio training course, which will be developed during the two-year project. The purpose of this study is to provide insights for the course developers and to serve as background material for all e-portfolio trainers in the growing e-portfolio community and beyond.