Norms are regularized patterns of attitudes and behavior that characterize a group of individuals, separate the group from other groups of individuals, and prescribe and describe attitudes and behaviors for group members. Relying on social identity theory and self-categorization theory, the role played by group norms within groups and the processes by which such norms are promulgated within groups are discussed. Norm talk or the communication of normative information within groups is explored, as a major proportion of communication within groups is dedicated to clarifying ingroup identities and group attributes such as attitudes and behaviors that characterize the group. Group members can glean normative information by attending to norm talk for instance, by listening to the content of fellow group members’ communications, from their behavior, and from influential or prototypical sources within the group. According to self-categorization theory, once individuals categorize themselves as members of a salient group or category, they represent normative information cognitively as ingroup prototypes. Prototypes are a fuzzy set of group attributes (such as attitudes and behaviors that characterize the group) and simultaneously minimize differences within groups while maximizing differences between groups. Thus, clear group prototypes help create distinct identities that are clearly demarcated from other groups. Group members should be especially attentive to information that flows from prototypical sources within groups—such as leaders and ingroup media sources—while efforts should be made to differentiate from marginal or deviant members who deviate from the prototype and reduce clarity of ingroup prototypes. The processes through which attending to information communicated by different sources within groups—both prototypical and non-prototypical—help group members seek normative information and clarification of ingroup prototypes are discussed.