A big portion of the marginalized adult population has never seen their competences certified due to noncompletion of any kind of school. As adults, former drop outs, people with learning disabilities and migrants are missing these recognized skills, not being able to attend standard adult training, and having to face the already scarce chances to access the labour market which increases their social exclusion. The aim is to create an attractive, practical training model which does not require attendance in the classroom attendance, but allows for learning-on-the-job, in order to transfer and certify basic skills to the target population. ETOS will develop a training model which will be performed on the job and not in classrooms. Through practical, interrelated activities, entrepreneurs (small, sole proprietorship) are becoming adult trainers and receive support by experienced tutors. The project will also develop a new EU skills certification based on an innovative evaluation model in line with the ECVET system requirements, awarded at the end of the training path. To achieve these results ETOS will elaborate a state of the art analysis and a training need assessment among 90 stakeholders in 6 EU countries. After the provisional draft of the training model and the certification system their contents will be transmitted to 90 adult trainers which later will perform the pilot training with 144 final beneficiaries. The feedback collected by adult trainers performing the pilots will refine, finalize the two outcomes published as handbooks. To keep ETOS running long-term the consortium will implement 2 Grundtvig In-Service Training courses, organize 6 workshops with stakeholders and decision makers, as well as commit 20 EU public administrations to require the ETOS approach on behalf of local training entities. The project will be disseminated by a website, newsletters, press releases, media events and 6 local seminars. Quality assurance is granted by a continuing monitoring system and by the feedback of an external evaluator.