Book excerpt: Language lies at the heart of the way we think, communicate and view the world. Most people on this planet are in some sense multilingual. The Multilingual Mind explores, within a processing perspective, how languages share space and interact in our minds. The mental architecture proposed in this volume permits research across many domains in cognitive science to be integrated and explored within one explanatory framework, recasting compatible insights and findings in terms of a common set of terms and concepts. The MOGUL framework has already proven effective for shedding light on the relationship between processing and learning, metalinguistic knowledge, consciousness, optionality, crosslinguistic influence, the initial state, 'UG access', ultimate attainment, input enhancement, and even language instruction. This groundbreaking work will be essential reading for linguists working in language acquisition, multilingualism, and language processing, as well as for those working in related areas of psychology, neurology and cognitive science.