 Simulation theorists take it for granted that we regularly engage in FP, but they hold that doing so does not imply the existence of a set of conceptually articulated ToM principles. They propose that as our minds are already populated with the relevant mental states and that we can systematically manipulate those mental states in precisely the sorts of ways TT principles aim to describe. Proponents of ST also propose that when we make mentalistic attributions to other minds we use our minds as models for those targets. Thus, even though the simulation process is a structured activity involving the attribution of mental state concepts, no theoretical principles need to be consulted or used when we understand minds in FP fashion.