Participation of Slovenian science in big collaborative international projects, exploring the frontiers of science, is of vital importance for the development of Slovenia. Carrying out research under equal terms with their colleagues from all over the world enables Slovenia and its researchers to: - participate in top research projects in one of the most propulsive fields of science, - publish in the most renowned scientific journals and take part in top-class international conferences, - ease formation of young researchers in international collaboration and competition with their fellow scientists from all around the world, - transfer research knowledge and experience into education at university and post-graduate level, - access and provide hands-on experience with the ultimate technology in the fields of detectors, electronics and computing, - transfer the applied technologies to Slovenia - apply know-how to other fields of science and technology - provoke participation of Slovenian industry in development and production of high-tech products.