 Claims that the mind has a modular architecture, and even massively modular architecture, are widespread in cognitive science (see e.g. Hirshfield and Gelman 1994). The massive modularity thesis is first and foremost a thesis about cognitive architecture. As defended by evolutionary psychologists, the thesis is also about the source of our cognitive architecture: the massively modular architecture is the result of natural selection acting to produce each of the many modules (see e.g. Barrett and Kurzban 2006; Barrett 2012). Our cognitive architecture is composed of computational devices, that are innate and are adaptations (cf. Samuels 1998; Samuels et al. 1999a; Samuels et al. 1999b; Samuels 2000). This massively modular architecture accounts for all of our sophisticated behavior. Our successful navigation of the world results from the action of one or more of our many modules.