The specific OAR goals are enumerated in the right panel. Their type could be Maximum or Mean dose, or a DVH point (volume at dose). As opposed to the weight factor from 0 to 100 used on the standard optimization tab, the user can qualitatively assign the relative importance of an individual goal (Priority) as High, Medium, or Low. It can be also specified as a hard constraint, but that option is seldom used as being too restrictive. The last column in Fig. 1 is Compromise. It is applicable to the situations when an OAR overlaps with a target. If the box is checked, it essentially means that the target owns the overlapping voxels and the OAR sparing could be compromised to achieve proper target coverage. That would be typically representative of a situation with a parallel OAR. For a serial OAR (e.g., the spinal cord), the box is left unchecked and the overlapping voxels are entirely owned by the OAR.