- More countries are becoming cultural heterogeneous because of immigration, changing these countries in many ways. It also has an affect on all the citizens living in these countries of destination; not only does this change their mainstreamer populations, the immigrants undergo changes as well. The term multiculturalism refers to all these changes and in the various disciplines in which multiculturalism is studied, the term has many meanings and components. In psychology, multiculturalism refers to an ideology and is defined as the acceptance of different cultures in a society and also to the active support for these cultures by both the majority members and the minority group members. This definition has close relations with statements of multiculturalism policies, in which it is stressed (among other things) to support the cultural diversity by approving the cultural maintenance of immigrants, to have intercul- Eural interactions, full participation of all groups, and mutual group acceptance and tolerance. But then several questions arise to what extent majority group members and immigrants support such a multiculturalism policy, why they support or do not support this po- icy, and if their support is stable over time. This thesis is an attempt to carefully answer these questions by examining the psychological concept of multiculturalism, focusing on its ideological and political aspects.