 Kitcher’s model shows that scientists in the sort of scenario sketched above will divide labor more effectively when they are motivated by credit than when they are pure truth-seekers. Truth seekers will each take the more promising approach. For credit-maximizers, once too many individuals work on the better problem, the expected credit for each scientist decreases to the point that some individuals will prefer to switch. Strevens (2003) extends Kitcher’s work by arguing that an existing feature of credit incentives, the priority rule, can lead to an even better division of labor. This is the rule, identified by Merton, which stipulates that credit will be allocated only to the scientist who first makes a discovery. In Strevens’s model, researchers incentivized by the priority rule divide labor in a highly efficient way compared to researchers incentivized by other credit schemes.