The society demand across EU for high quality training of social care staff in the senior care service sector has been steadily growing. This need was addressed by the ACE project (2014-1-CZ01-KA202-002058), which was completed in 2017. The principal output of the ACE project is an innovative senior service worker training system (SSW Course). The Course learning materials were developed in the working language of the partnership (EN) and in five languages of the ACE consortium members (CZ, DE, HU, IT, LT).At the beginning of the post-project phase in 2018 ACE partnership members started implementing their sustainability plans and notably the members from the Czech Republic and Italy have seen a positive response from the target groups. The intensive exploitation of the SSW Course and the potential of related ACE products led us to resume the cooperation with the goal of: 1. Secure top-grade professional development for the SSW Course CVET/VET trainers in response to expected high demand for training;2. Extend the level of usage experienced in the Czech Republic and Italy to the other ACE partnership countries (Germany, Hungary, Lithuania);3. Support usage of the SSW Course by elaborating its training methodology into even greater level of detail.With these goals in mind a new partnership has been formed: Two original members of the ACE partnership remained (ACZ from the Czech Republic and PLIS from Italy) and three new members joined (ITINKLAS from Lithuania, NHE from Hungary and NBH from Germany). All new members have an excellent potential for accomplishing the goals that were set out.VET/CVET teachers/trainers of social care workers are the primary beneficiaries and the focus of the proposed project. The project will be for the most part accomplished in a series of joint trainer staff workshops focused on exchange of know-how and best practices of all participants. In structured workshop sessions participating trainers will enhance considerably their professional competences and the workshops will also generate a set of outputs consisting of detailed lesson plans, worksheets and comprehensive methodology recommendations for training of social care workers in the ACE SSW courses.The proposed project implementation will start in November 2020. After completing the necessary preparatory steps all project partners will meet at the kick-off meeting in January 2021, where they will plan and agree on detailed project parameters. Each consortium partner will establish a study group of about ten staff members possessing one or more of the following areas of expertise:•Social care worker educators/trainers,•Seniors social and/or health care experts,•Adult training methodology experts.Study groups members will participate in joint staff workshops aimed at exchange of know-how and best practices. Before the first of best practice exchanges is organized a preparatory workshop will take place in March 2021, where the partners will work out the framework for joint staff workshops. Subsequently five cycles (one per each partner) of 5-day joint staff workshops will take place in regular 3-months long intervals. The first workshop will be conducted in April 2021, the fifth one in April 2022. After this the last workshop in July 2022 will evaluate and summarize outcomes of all exchanges. The best practices identified will be highlighted in amended SSW Course worksheets and methodology materials. The project will be concluded in October 2022.The study group of trainers participating in the joint staff workshops will obtain the immediate benefits of the work program. Exchange of know-how and best practices with the other experts and the common team work on development of innovative and effective teaching methods will benefit their professional development considerably. We also expect that a transfer of experience will take place among the lectors who participated in the exchanges and their other colleagues.Improvements in professional development of the trainer staff will have a profound positive impact on the quality of service partnership members will provide to their clients, public bodies, interest groups and other stakeholders when delivering SSW Course training.Results of the project will be freely available on the dedicated project website and on all partners’ websites as well, along with learning materials of the ACE SSW Course. Enhancing and detailing the training methodology of the SSW Course will support wider adoption of the ACE training system by peer training organizations on the regional and national levels. Finding new ways by the partnership of engaging the ECVET system for assessment and validation of professional competencies, which was developed in the ACE project, will have a positive impact in improved care staff mobility and transferability of competences, initially within the boundaries of our partnership and later among other EU member states.