In the past 2 years, JET has contributed with a wealth of results to nearly all topics of the science of ITER.Significant developments in the reference operational scenarii of ITER has been obtained. Scaling studies of various physical properties of ELMy H-Mode and Advanced Scenarii have been refined. Progress in real-time control techniques, which have greatly contributed to the successful developments in ELMy H-Modesand Advanced Scenarios, is illustrated. Detailed studies have been undertaken related to the first wall, with much more details on the nature of the ELMs, the impact of disruptions, tritium retention and erosion and co-deposition. Major advances have been made in heating systems, with a proof of principle test of theconjugate T ICRH scheme and demonstration of coupling of LH waves at large plasma-launcher distances. Significant progress has been made in various diagnostics at JET, more in particular in Burning Plasma Diagnostics.