The ECVET-Trainer project is aimed at facilitating the understanding of the ECVET model by VET trainers and centres in the four key productive sectors of the EU (agriculture, industry, construction and services). The contribution of VET teachers and trainers (hereafter VET trainers) to the European policies of Lifelong learning is widely known, as well as their acknowledgement as key stakeholders for the goals of the ET2020 and for the implementation of ECVET model and other European instruments, based on a learning outcomes approach. Up to now, VET teachers and trainers have not been officially involved in the implementation of ECVET. In some countries developing projects and pilot experiences, trainers have collaborated on the design of the different elements of ECVET, such as in the description of learning outcomes. In the development ECVET it is expected that they can assume tasks for assessing learning outcomes and develop guidance activities. One of the most important findings of this project deal with the possible role of VET teachers and trainers would assume in the development of ECVET taking into account the different principles of this credit methodology: description of qualifications, desing of units of learning outcomes, allocation of ECVET points, collaboration with competent institutions, participation in the Memorandum of Understanding and development of Learning agreements, assessment of learning outcomes and their contribution in the relation between ECVET and ECTS methodologies.