This document summarizes John Schumann's 1978 Acculturation Model of second language acquisition. The model proposes that the degree to which a language learner acculturates into the target language group controls how much of the second language they acquire. It identifies social and psychological factors that influence acculturation and language learning, such as social dominance, intended length of residence, motivation, and language or culture shock. While influential, critics note that the model cannot be generalized to all types of second language learning.