The term cross-cultural adaptation refers to the complex process through which an individual acquires an increasing level of the communication skills of the host culture and of relational development with host nationals. Simply put, cross-cultural adaptation is the transformation of a person’s own PSI schemas into those of the host culture and acquisition of new PSI schemas in the host culture s/he is residing in. A number of different people may b e subject to cross-cultural adaptation, including immigrants, refugees, business people, diplomats, foreign workers, and students. However, this entry specifically applies cultural schema theory to sojourners’ cross cultural adaptation. Sojourners generally spend a few years in another culture while intending to return back to their home country. Business people, diplomats, students, and foreign workers can all be classified as sojourners. In order to better explain sojourners’ cross-cultural adaptation, axioms are used to express causal, correlational, or teleological relationships. Axioms also help to explain the basic assumptions of the Cultural Schema Theory (Nishida, 1999).