Acculturation is the process of cultural change that takes place as a result of contact between cultural groups. It is also a process of psychological change among individuals who are members of these different groups. Such contact and change occur during colonization, military invasion, migration, and sojourning (e.g., tourism, international study, overseas posting). It continues after initial contact in culturally plural societies, where ethnocultural communities maintain features of their heritage cultures. Adaptation to living in culture contact settings takes place over time. Occasionally it is stressful, but often it results in some form of accommodation. Acculturation and adaptation are now reasonably well understood, permitting the development of policies and programs to promote successful outcomes for all parties.