Leonard Lieberman, Rod Kirk, and Alice Littlefield report a significant decrease over the past 20 years in the percentage of physical anthropologists who support the race concept, while Matt Cartmill concludes that use of this concept did not decline during that period among anthropologists who study modern human variation. Neither study contradicts the other, since the two used different definitions and sampled different populations. More extensive sampling of the literature and more reliable survey techniques are needed to resolve the issue.