This paper describes the installation of the new JET Shape Controller System especially focusing on the addition of the Extreme Shape Controller. The activity was performed by the JET Operator in co-operation with the ENEA-CREATE design team, and involved both changes in the hardware and system software of JET and tuning of the proposed XSC design to satisfy the practical requirements of tokamak operation. The application of ten years experience of controller implementation and commissioning combined with a modern and efficient modelling and design methodology has allowed an unprecedented fast and easy commissioning of the new system.