"Social identity theorists regard the group as a collective of similar persons all of whom identify with each other in similar ways, and hold similar views, all in contrast to members of outgroups. Identity theorists regard the group as a set of interrelated individuals, each of whom performs unique but integrated activities, sees things from his or her own perspective, and negotiates the terms of interaction."

- Burke, Peter J.; Jan E. Stets 2000. Identity Theory and Social Identity Theory. Social Psychology Quarterly 63(3): 224-237