 Tremor is the most salient symptom of Parkinsons disease IPSidiopathic Parkinson syndrome. Other symptoms are bradykinesia, rigidity and postural instability. As much as 75 of patients with IPS show resting tremor. Initially, tremor is typically unilateral and only visible in stress situation. In the later stage of the disease it becomes bilateral. The OPINION trial aims at the investigation of a combined approach to thalamicsubthalamic deep brain stimulation DBS for the treatment of patients with tremor dominant IPS or patients with equivalent type IPS who perceive tremor to be their dominant symptom. The planned approach will for the first time allow for the direct comparison of each condition in a homogeneous patient population and will furthermore allow an intra-individual comparison of the different stimulation conditions Ventral intermediate nucleus VimDRT - Subthalamic nucleus STN - VimDRTSTN with the outcome parameter quality of life. 