1. A computer-implemented method; comprising: determining, by a computer processor, a volume of activation (VOA) of tissue estimated to be activated by stimulation provided according to a set of stimulation parameters; generating and outputting, by the processor, a first score for the VOA based on a) an amount by which the VOA overlaps another obtained volume and b) at least one of the following: 1) a size of an area formed by a combination of the VOA and the other obtained volume, 2) a size of a predetermined area excluding both the VOA and the other obtained volume, or 3) an amount of the VOA that does not overlap the other obtained volume; and upon manipulation of a user-manipulable control, outputting a set of stimulation parameters corresponding to the VOA to initiate stimulation of patient tissue using a leadwire implanted in the patient tissue.