The mobility within the education and vocational training sectors is one of the main objectives of the EU action.Transnational mobility, in fact, may represent for many European citizens the opportunity through which acquire those competences which will allow them to access the labor market. Not all European countries foresee specific policies aimed at investing in this learning modality. Being not only a problem of resources, in order to reach the goal to guarantee more opportunities for everyone, it is necessary to improve the training programmes addressed to those professionals in charge of efficaciously promoting, managing and planning mobility experiences: teachers and trainers. Actually, on one side, they are asked to play new roles implying the acquisition of those skills necessary to create relationships and cooperation modalities with enterprises, local administrations, social parties; while on the other, they should also have to become facilitators of mobility interventions, since these ones are strictly linked to the growth and development of individuals. PROMETEUS main aim was to transfer to teachers and trainers an e-learning training Model developed in a previous LLP-LDV project (OUT-IN) providing didactic contents, tools and materials concerned with all aspects related to the planning, managing and implementing a Mobility intervention. The national territories involved in the transfer action were Italy, France and Spain, where despite the rates of Young involved in mobility experiences are pretty high, the balance between mobility proposals presented and approved is still very low. Most of the times, in fact, good ideas are not supported by the right implementation conditions (e.g. partnerships dimension, full knowledge of administrative rules, poor knowledge of the “technical and proper language”, etc.) or proper know-how in planning a proposal. For these reasons and, so, in order to promote the quality increasing of mobility proposals, PROMETEUS had the purpose to support the training of teachers and trainers also through Project Work Labs and tutoring actions.The partnership involved organisations representing Italy, France and Spain: three Italian Local Administrations (Provinces); the Italian technical assistance Agency supporting provinces at national level; one Managing consulting group; the largest Public Network for Adult Education in France and a Network of training centres in Spain.