Social identity theory and self categorization theory.

Political behaviour always involves social groups, whether these take the form of concrete networks and gatherings of individuals such as pressure groups, demonstrations, governments, cadres or committees, or whether they are constituted as large-scale institutions or imagined communities (Anderson, 1991) such as polities, states, political parties, interest groups, publics, constituencies or electorates. In so far as social groups are central to politics, it follows that the psychology of groups should be relevant to our understanding of political psychology. Social Identity Theory and Self-Categorization Theory represent major theoretical attempts to clarify the social psychological processes associated with group membership and action, and should therefore be in a good position to provide a significant contribution to that understanding.