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“Of course, a group of individuals who are currently in the same place may nevertheless easily turn into a social group if something happens that brings them “together.” For instance, if a man in the checkout line of the supermarket suddenly collapsed on the floor, it is likely that the others around him would begin to work together to help him. Someone would call an ambulance, another might give CPR, and another might attempt to contact his family. Similarly, if the movie theater were to catch on fire, a group would form as the individuals attempted to leave the theater. And even the class of students might come to feel like a group if the instructor continually praised it for being the best (or worst) class that he or she has ever had. It has been a challenge to characterize what the “something” is that makes a group a group, but one term that has been used is entitativity (Campbell, 1958; Lickel et al., 2000). Entitativity refers to something like “groupiness”—the perception, either by the group members themselves or by others, that the people together are a group.”