One hundred eighty one sets of black twins and 223 sets of white twins provided responses to four 12-item subtests of the Raven's Progressive Matrices Test, Standard Version. The children were in elementary school and their item response patterns were analyzed with the use of revised ordering-theoretic methods to search for best-fitting hierarchies without any item intransitivities occurring. The item hierarchies generated for the two races for each subtest were found to be quite similar in terms of the number of item prerequisite relations that were shared. However, some items were located as acting quite differently with respect to their placements in their respective item hierarchies. One benefit to item hierarchy analysis and ordering theory is that the learning hierarchy and/or pattern of acquisition for a set of test items for each of several social groups can be easily determined. (Author/RC)