**7. Summary and outlook**

This chapter is meant to be a short overview of the facts concerning the Grid computing for HEP experiments, in particular for the experiments at the CERN LHC. The experience gained during the LHC operations in 2009-2011 has proven that for this community, the existence of a well performing distributed computing is necessary for the achievement and fast delivery of scientific results. The existing WLCG infrastructure turned up to be able to support the data production and processing thus fulfilling its first-plan mission. It has been and will be continuously developing into the future absorbing and giving rise to new technologies, like the advances in networking, storage systems and inter-operability between Grids and Clouds [70,71].
