The minority population in the United States is larger than the total population of all but 11 countries with Asian Americans comprising the third largest group. This review will be a useful resource for researchers or practitioners seeking information on why acculturation is important. The review will confirm how acculturation has outcomes for Asian American's physical health, adjustment, school performance, and response to counseling or psychotherapy. The review will also suggest implications that various research findings have for future research as well as implications for practitioners working with Asian American clients.