There is a growing view that intelligence evolved as a product of social interdependence. The unique development of human intelligence was probably linked to the use of spoken language, but language itself evolved in the context of social interaction, and in its development it has shaped - and been shaped by - social institutions. Taking as their starting-point the social production of intelligence and of language, scholars across a range of disciplines are beginning to rethink fundamental questions about human evolution, language and social institutions. This volume brings together anthropologists, linguists, primatologists and psychologists, all working on this new frontier of research.