Reading Awakens Imagination, Nourishes Brain, Opens Worlds (R.A.I.N.B.O.W.) is our way of stressing out the importance of reading nowadays, not only as a means of personal development or simply a pastime, but as a way to promote priorities and values applying to the whole of mankind. This ERASMUS+ project has been designed by teachers coming from Spain, Croatia, Finland, Germany, Greece and Poland in order to address the needs of primary and secondary school students, taking into account the SWOT analysis carried out in each school. It has been noted that these needs comply with the three main axes which are predefined for Erasmus+ projects: 1. To improve reading skills and interest towards reading, promoting the acquisition of skills and competences for all participants involved. 2. To promote social inclusion, tolerance and understanding between cultures, by focusing on the social and educational value of European cultural heritage. We confronted xenophobic attitudes, created cooperation networks and strengthened our European spirit. 3. To share best practice and methods in teaching and learning and to improve language and ICT skills, sharing innovative activities and methods and promoting teachers’ professional development. The protagonists in the project were students 9-14 years old, out of whom the participants of mobilities were chosen; their task was to attend mobilities and host their peers. Nevertheless all the students of the schools were involved and participated in activities appropriate for their age. The project also included students facing various obstacles (economic, social, health, educational). All the teachers supported project work, some of them directly and some indirectly through incorporating project themes into their subjects' curricula and in the individual classroom program. Parents organized the accommodation of the visiting students, various events and participated in certain project activities. We cooperated with libraries, municipalities, orphanages, etc. During the project we implemented six sub- projects, one every trimester. The activities took place in each of the partner schools prior to the meetings and the presentation of their effects were the main point of each meeting. Some adjustments due to COVID-19 were made. Throughout the project we used student activating methodologies: The students worked in transnational teams with students of different ages, knowledge and ones of fewer opportunities. The students worked actively producing results and discussing in groups to encourage peer-to-peer learning. Modern methods that enhance ICT skills were also a vital part of the project, resulting in mutual sharing of ideas and experiences in this area. The activities included CLIL, PBL and Game Based Learning methodologies in order to encourage students to love reading through playful activities, according to their skills and needs. The participants were introduced to a phenomenon based learning method which is an integral part of the new curriculum in Finland. For students and their families, the project broadened their horizons towards people from EU countries with particular emphasis on introducing the cultural features of partner countries. Teachers developed their professional and personal skills, other school staff improved their management skills with the project tasks and established a constant co-operation with the local community that promoted and linked important pillars of society: school-parents-local community institutions- European institutions. The results grew slowly, according to the planned modules, and were used during the project, but will be used after its completion as well. Our project’s visible results were: eTwinning project (https://twinspace.etwinning.net/70839/home), ebooks, a glossary, Book Club, Live Library and many more, all of which are available through our project website (https://rainbowerasmus.eu/) and our YouTube channel (Rainbow Erasmus). Our diffusion strategy involved making our experience accessible to everyone interested, either online or by local seminars and informative events. We expect the continuation of the internationalization of schools by new EU projects and project activities that create significant links to schools at home and abroad, also motivating others to join us. We will continue practicing certain project activities in the future. One of them is the Book Club which has been established in each school as a new extracurricular activity. Teaching has been updated with the new methods, teachers were encouraged to continue developing communication and ICT skills, and project results were promoted on important sites such as School Education Gateway, eTwinning and the official website of national school portals. All these activities ensure the sustainability of the project and its achievements, as they are ascertained by the evaluation carried out during and after the end of the projec