1. A computer implemented method of locating expertise, comprising: associating experts with respective certain objects, each object inheriting from classes in a hierarchy, said associating resulting in respective correspondences between experts and the certain objects; using the correspondences in a computer processor routine, finding a candidate expert about a particular subject area, the candidate expert being in one of the correspondences associating the candidate expert with one of the certain objects; and displaying as output an indication of the candidate expert.