 ST takes this commonsensical idea seriously and develops it into a fully-fledged theory. At the core of the theory, we find the thesis that mental simulation plays a central role in mindreading: we typically arrive at representing others’ mental states by simulating their mental states in our own mind. So, to figure out my chess opponent’s next decision, I mentally switch roles with her in the game. In doing this, I simulate her relevant beliefs and goals, and then feed these simulated mental states into my decision-making mechanism and let the mechanism produce a simulated decision. This decision is projected on or attributed to the opponent. In other words, the basic idea of ST is that if the resources our own brain uses to guide our own behavior can be modified to work as representations of other people’s mental states, then we have no need to store general information about what makes people tick: we just do the ticking for them. Accordingly, ST challenges the Theory-Theory of mindreading (TT), the view that a tacit psychological theory underlies the ability to represent and reason about others’ mental states. While TT maintains that mindreading is an information-rich and theory-driven process, ST sees it as informationally poor and process driven (Goldman 1989).