What are concepts, and can a predictive model have them? This chapter explores this matter, drawing on ideas and findings in Carey, S. (2009) The origin of concepts, Keil, F. C. (1992)Concepts, kinds, and cognitive development, DiSessa, A. A. (1993) Toward an epistemology of physics, and Minstrell, J. (1982) Explaining the “at rest” condition of an object.