Cross-cultural psychology is differentiated from cultural psychology, which refers to the branch of psychology that holds that human behavior is strongly influenced by cultural differences, meaning that psychological phenomena can only be compared with each other across cultures to a limited extent. In contrast, cross-cultural psychology includes a search for possible universals in behavior and mental processes. Cross-cultural psychology "can be thought of as a type research methodology, rather than an entirely separate field within psychology". In addition, cross-cultural psychology can be distinguished from international psychology which centers around the global expansion of psychology especially during recent decades. Nevertheless, cross-cultural psychology, cultural psychology, and international psychology are united by a common concern for expanding psychology into a universal discipline capable of understanding psychological phenomena across cultures and in a global context.