Initial reports of managing migraine headache with ONS described a technique in which electrical leads were implanted in the subcutaneous space transverse to the occipital nerve, in the back of the head, under x-ray guidance. The leads were tunneled under the skin to an implantable pulse generator (IPG) implanted in the chest wall or abdomen. The OPTIMISE Trial is designed to be a pivotal study of the Boston Scientific PRECISION neurostimulation system, when the system is used for ONS. The PRECISION System has been previously been approved for Spinal Cord Stimulation (SCS).