This paper uses Pierre Bourdieu’s field theory to develop tools for analyzing interdisciplinary scientific fields. Interdisciplinary fields are scientific spaces where no single form of scientific capital has a monopoly and therefore multiple forms of scientific capital constitute the structures and stakes of scientific competition. Scientists compete to accumulate and define forms of scientific capital and also to set the rates of exchange between them. The paper illustrates this framework by applying it to the interdisciplinary field of behavior genetics. Most (...) behavior geneticists envision their participation in the field as a means to compete for scientific capital in other fields. However, the scientific capital of behavior genetics has different values for scientists attempting to deploy it in different neighboring fields. These values depend on situations in each field and the ways behavior genetics mediates relationships among them. The pattern of relationships of exchange helps explain the social hierarchy and several features of knowledge production within behavior genetics. (shrink)