A system comprising: a user interface; and a processor so adapted that it: stores an atlas within a memory, the atlas specifying respective locations within an atlas coordinate system for each of a plurality of predefined anatomical structures within a reference anatomical region of a reference anatomy; displays an image of the reference anatomical region of the reference anatomy on the user interface; correlates a location of at least one implantable medical lead within a patient to the atlas coordinate system; receives a selection from a user that identifies at least one of the anatomical structures for receipt of electrical stimulation; correlates the location of the identified at least one anatomical structure to the location of the at least one lead that has been correlated to the atlas coordinate system; and determines electrical stimulation parameters in a programming device based upon the location of the at least one lead relative to the identified structure in order to stimulate the at least one structure; wherein the processor determines an error value based on a volume of extraneous tissue that would be stimulated by delivery of stimulation according to the determined electrical stimulation parameters, characterised in that said processor is further adapted such that it compares the error value to a threshold value, and prompts a user based on the comparison. a user interface; and a processor so adapted that it: stores an atlas within a memory, the atlas specifying respective locations within an atlas coordinate system for each of a plurality of predefined anatomical structures within a reference anatomical region of a reference anatomy; displays an image of the reference anatomical region of the reference anatomy on the user interface; correlates a location of at least one implantable medical lead within a patient to the atlas coordinate system; receives a selection from a user that identifies at least one of the anatomical structures for receipt of electrical stimulation; correlates the location of the identified at least one anatomical structure to the location of the at least one lead that has been correlated to the atlas coordinate system; and determines electrical stimulation parameters in a programming device based upon the location of the at least one lead relative to the identified structure in order to stimulate the at least one structure; wherein the processor determines an error value based on a volume of extraneous tissue that would be stimulated by delivery of stimulation according to the determined electrical stimulation parameters, characterised in that said processor is further adapted such that it compares the error value to a threshold value, and prompts a user based on the comparison. stores an atlas within a memory, the atlas specifying respective locations within an atlas coordinate system for each of a plurality of predefined anatomical structures within a reference anatomical region of a reference anatomy; displays an image of the reference anatomical region of the reference anatomy on the user interface; correlates a location of at least one implantable medical lead within a patient to the atlas coordinate system; receives a selection from a user that identifies at least one of the anatomical structures for receipt of electrical stimulation; correlates the location of the identified at least one anatomical structure to the location of the at least one lead that has been correlated to the atlas coordinate system; and determines electrical stimulation parameters in a programming device based upon the location of the at least one lead relative to the identified structure in order to stimulate the at least one structure; wherein the processor determines an error value based on a volume of extraneous tissue that would be stimulated by delivery of stimulation according to the determined electrical stimulation parameters, characterised in that said processor is further adapted such that it compares the error value to a threshold value, and prompts a user based on the comparison.