 A unifying idea that motivates all TT proposals is that the primary job or function of folk psychology is that of third-personal prediction and explanation. The standard TT assumption is that prediction and explanation are symmetrical: predicting how another creature might act or, on the flip side, explaining why it acted, requires representing its complex state of mind—namely, the way certain of its mental states relate to one another. Putting all of this together can promote the appearance that FP is in the same general line of business as scientific theories that are used to understand other phenomena.