"When the European Trainer Teacher Tandem project (ETT Tandem) was set up in 2014, Europe was undergoing a deep financial crisis which had a devastating impact on youth unemployment, especially in Greece, Spain and Italy amongst other countries. Germany, on the other hand, managed the crisis quite well and did not suffer higher unemployment among the youth. As a consequence, the interest in the German dual training system massively increased in Europe. It was this situation that brought about the idea of a tandem for teachers and trainers of different European vocational education systems. Partners of the European InnMain Network developed the idea to learn from each other through allowing the opportunity to participate in typical learning environments of the relevant partner organisations in order to improve the teachers' and trainers' professional, pedagogical and personal knowledge and skills. From its early beginnings, the idea to ""think out of the box"" and gain experience from European partners has been a fundament of the European Union as well as the Erasmus+ programme whose validity remains unchanged until today's date. Some of the ETT Tandem partners, who had been organising exchange programmes for their students over a longer time, came up with the idea not only to exchange students, but give their professional staff equal opportunity to enjoy international teaching and learning experiences. Hence, the objective of the ETT Tandem project was to develop a guideline for such Trainer Teacher Tandems among European partners in vocational education, the so-called ""ETT Tandem Model"". The model allows collaborative learning, exchange and transfer of good practice experiences made by trainers and teachers in a real training environment such as vocational schools or training centres (or by e.g. companies, chambers, schools) with focus on the practical parts of the vocational education and training.Partners from six European countries were actively involved in the ETT Tandem project. These included: BFI OOE - BFI-Institute for Vocational Advancement, an Upper Austrian vocational training institution. BFI Upper Austria provides vocational education and training in a wide context of areas. Part of its educational activities focuses on training schemes aimed at the (re-)integration of unemployed persons or persons disadvantaged in the labour market. Those pertinent educational and occupational schemes are designed and organised in close co-operation with the Austrian Public Employment Service (AMS) and companies. The vocational school Istituto Tecnico “Attilio Deffenu” of Olbia in Italy which provides research and experimentation in education, aiming at innovative teaching and methodology. The Οργανισμού Απασχόλησης Εργατικού Δυναμικού (ΟΑΕΔ) or Organismou Apascholisis Ergatikou Dynamikou (OAED), also known as the Manpower Employment Organization of Greece, is a public authority that handles vocational training, job search assistance, labour and policy development, as well as unemployment and maternity benefits. Teknisk Erhvervsskole Center (TEC) is a large vocational college, situated on 5 campuses in Greater Copenhagen, attending 25,000 students during a year. TEC has a history of more than 135 years – the institution as it looks today is a dynamic merger of six institutions, the first merger starting out in 1999. TEC has a staff of 750 and offers around 25 different VET programmes and 3 Higher Technical Examination Programmes and several Adult Vocational Programmes. XABEC is a vocational training centre operating since 2008 and is promoted by the EIFOR Foundation of the Region of Valencia. The EIFOR Foundation of the Region of Valencia aims at promoting, fostering and supporting social, welfare, cultural, research and development initiatives. The Central Agency for Continuing Vocational Education and Training in the Skilled Crafts (ZWH e. V.) is a service provider for all educational institutions in the skilled crafts sector and operates nationwide. It is supported by the 53 chambers of skilled crafts, the regional associations and the German Confederation of Skilled Crafts (ZDH).In the course of the European Trainer Teacher Tandem pilot project, six transnational meetings took place in six different countries, five times with simultaneous tandem activities. The meetings took place at the partner organisations' places. The places chosen were very diverse ranging from vocational schools with only small practical workshops to public-private partnership training centres and work-based learning in companies. This variety had a deep impact on the development of the ETT Tandem Model. It proved that the Model has to be an open, flexible and inspiring model rather than a limiting one. It may provide recommendations, advice and ideas while simultaneously providing space for adjusting and widening the idea of European Trainer Teacher Tandems in relation to the local conditions and environment."