 Evolutionary psychologists focus on psychological adaptations. One consistent theme in the theoretical work of evolutionary psychologists is that “adaptations, the functional components of organisms, are identified […] by […] evidence of their design: the exquisite match between organism structure and environment” (Hagen 2005, 148). The way in which psychological adaptations are identified is by evolutionary functional analysis, which is a type of reverse  engineering.[8]  “Reverse engineering is a process of figuring out the design of a mechanism on the basis of an analysis of the tasks it performs. Evolutionary functional analysis is a form of reverse engineering in that it attempts to reconstruct the mind’s design from an analysis of the problems the mind must have evolved to solve” (Buller 2005, 92). Many philosophers object to evolutionary psychologists’ over attribution of adaptations on the basis of apparent design. Here some are following Gould and Lewontin’s (1979) lead when they worry that accounting for apparent design in nature in terms of adaptation amounts to telling just-so stories but they could just as easily cite Williams (1966), who also cautioned against the over attribution of adaptation as an explanation for biological traits. While it is true that evolutionary functional analysis can lend itself to just-so story telling, this is not the most interesting problem that confronts evolutionary psychology, several other interesting problems have been identified. For example, Elisabeth Lloyd (1999) derives a criticism of evolutionary psychology from Gould and Lewontin’s criticism of sociobiology, emphasizing the point that evolutionary psychologists’ adaptationism leads them to ignore alternative evolutionary processes. Buller takes yet another approach to evolutionary psychologists’ adaptationism. What lies behind Buller’s criticisms of evolutionary psychologists’ adaptationism is a different view than theirs about what is important in evolutionary thinking (Buller 2005). Buller thinks that evolutionary psychologists overemphasize design and that they make the contentious assumption that with respect to the traits they are interested in, evolution is finished, rather than ongoing.