  For two decades, success on the false belief task was considered the only really hard evidence for a claim that one had a theory of mind. Whatever social competence children showed before passing the false belief test was widely considered a precursor to having a theory of mind. More recently, however, cognitive developmentalists have argued that success on the false belief task is neither necessary nor sufficient for the attribution of a theory of mind, and that focusing nearly exclusively on it has led to an overly narrow view of the conceptual domain (Bloom &amp; German 2000). The last several years have seen a plethora of studies investigating the attribution of mental states, and social cognition more broadly, in infants. The next section focuses on a group of key concepts involved in understanding minds including goals, agency, and rationality.