 Naturalists tend towards conceptual conservatism. They typically appeal to our intuitions about illness as support for their own emphasis on underlying bodily malfunction. This assumes that our current concept is in good shape, that common sense and medicine share a concept of disease, and that medicine should respect lay intuitions about what is or is not a disease. Like many philosophers who think about other concepts with both scientific and common sense uses, conservative naturalists about disease think that folk concepts specify what counts as health and disease. The job of medicine is to look at the world and see if anything in nature falls under the concept as revealed by analysis (cf the “Canberra plan” of Jackson 1998) For revisionists, this understanding of common sense in its relation to science is needlessly submissive to folk intuitions. A more revisionist view takes the relevant concepts to be defined by their role in scientific theories – Boorse (1997) has argued that disease is a term of art in pathology.