Overview of the JET results in support to ITER

The 2014-2016 JET results are reviewed in the light of their significance for optimisingthe ITER research plan for the active and non-active operation. More than 60 h of plasmaoperation with ITER first wall materials successfully took place since its installation in2011. New multi-machine scaling of the type I-ELM divertor energy flux density to ITERis supported by first principle modelling. ITER relevant disruption experiments and firstprinciple modelling are reported with a set of three disruption mitigation valves mimickingthe ITER setup. Insights of the L-H power threshold in Deuterium and Hydrogen are given,stressing the importance of the magnetic configurations and the recent measurements offine-scale structures in the edge radial electric. Dimensionless scans of the core and pedestalconfinement provide new information to elucidate the importance of the first wall material onthe fusion performance. H-mode plasmas at ITER triangularity (H = 1 at ?N ~ 1.8 and n/nGW~ 0.6) have been sustained at 2 MA during 5 s. The ITER neutronics codes have been validatedon high performance experiments. Prospects for the coming D-T campaign and 14 MeVneutron calibration strategy are reviewed.