This document discusses the concept of acculturation, which refers to how individuals adapt when interacting with cultures different than their own. It defines acculturation as culture change that occurs through contact between two populations. Factors like language usage, social relationships, and religious beliefs can be used to assess levels of acculturation. John Berry's model of acculturation identifies four acculturation strategies individuals may use: integration, separation, marginalization, and assimilation. The document also discusses acculturative stress that can occur during cultural adaptation and implications for psychological assessment and treatment when working with clients from different cultures.