 As we have seen, much attention has been devoted recently to structural explanations in physics, namely explanations of specific phenomena given in terms of mathematical properties of the systems in which they occur. Bokulich 2011, generalizing notions of structural explanation developed in Railton 1980, Hughes 1989, and Clifton 1998 (Other Internet Resources), speaks of structural model explanation, “that is, one in which the explanandum can be seen as a consequence of the structure of the theory or theories employed in the model (in this case a particular blending of classical and quantum mechanics), which limits what sorts of objects, properties, states or behaviors are admissible within the framework of that theory” (p. 40).