Allen, C. and Bekoff, M. (forthcoming) Biological function, adaptation, and natural design. Philosophy of Science

Recently something close to a consensus about the best way to naturalize the notion of biological function appears to be emerging. Nonetheless, teleological notions in biology remain controversial. In this paper we provide a naturalistic analysis for the notion of natural design. Many authors assume that natural design should be assimilated directly to function. Others find the notion problematic because it suggests that evolution is a directed process. We argue that both of these viely equate design with function. We argue that the distinction between function and design is important for understanding the evolution of the physical and behavioral traits of organisms.