Social Identity Theory: The world has people living in a social context wherein they traverse the continuum between collective and personal selves. Different contexts in the society lead towards particular group membership salience. The first framework of theoretical presumption is the perspective of social identifies which holds that members in a group are motivated towards protecting their individual esteem and achieving a positive and different social identity. Such a drive for a positive identity in the society results into discrimination which can be expressed as directly harming to out groups or more generally as providing in-group based preferential treatment which is a process known as bias in-group (Thornley 1996).
Furthermore, the general tendencies that individuals require discriminating can be illustrated for minimal paradigm studies for groups. These in turn reveal the way in which mere categorization as a member of group can lead towards bias in-group. For example, the in-group members favouring over other members in out group when evaluating as well as when allocating resources.
Aversive racism theory: This theory is complementary to the theory of social identity and engages in further identifying the way in which discrimination of racial nature might inhibit or manifest itself. The framework for aversive racism has evolved essential for understanding the conflict psychologically afflicting various individuals with regard to their attitude racially (Rubery et al 1995). Changing norms in the society increasingly result in discrimination towards minority groups and related groups stigmatised. For groups with higher status, group justification and ego correspond to beliefs that the system is fair and that their higher status offers a rewards them being worthy for it. This in turn leads towards bias in-group. Individuals with a personal and group benefit history often derive their prescriptive from description or in brief, labour under the illusion of “is ought. These members are of the belief that as this is how the world is and has looked for several years. They further think that this is the way in which it has to look like. For group members from low status, these justifications, however, require to be at odds if they are of the belief that their system is fair (Colgan et al 1996). Their low status can also be evident as deserved punishment for non-worthiness and can lead towards out-group bias expression or a perspective that out-groups are better and therefore require privilege. Therefore, the theory of system justification is such that it extends the perspective of social identity to explaining the reasons why inequalities as well as discrimination between groups is tolerated and perpetuated.