The coil systems for ITER will use Nb_3Sn superconductors in cable in conduit form at current levels of 40-60 kA and field levels up to 13 T. The scale of the coils is unprecedented. The selection and verification of the design criteria for the conductor and other components such as insulation, and shear keys between the Toroidal Field (TF) coils are major design and R&D issues. Manufacturing development will be addressed in a Model Coil programme and in construction of prototypical sections. The paper outlines several design issues and the status of the R&D activity that is currently under way.
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