The basic idea refers to cross-curricular projects and the main method will be flipped classroom. This project is for students from 11 to 15 years old. There will be several schools from different countries, and several teachers of various subjects in each school. Each teacher will cooperate with teachers from other countries and other subjects. The topics will be the ones which are common in the curricula of the teachers who work together. They will engage students in project work and thus decided for themselves the time length of their projects. Each teacher can work in one or several projects. The main method will be flipped classroom, but other approaches will be welcome as well. We will create international teams of students whenever it is appropriate for the tasks. Communication will be in English. The project will last from the end of September to the end of June. At the end of the project both teachers and students will do evaluation and self-evaluation of their work and experience in the project.