The project promotes the use of computer supported collaborative learning for mathematics and the creation of didactic material regarding C.L.I.L. (Content Language Integrated Learning). The collaborative school activities that cover maths concepts and that can be used as a classroom demonstration, homework, students groupwork, assesment, will be shared between teachers and students from different European countries. The ideas, the experiences and the didactic materials, produced during the class or computer laboratory activities will be published on the website of the project http://www.vivante.it/com@net/ and http://centros.edu.xunta.es/iesramoncabanillas/cropcircles/cropcircles_sp.htm