This introductory text brings together diverse perspectives and research streams on language attrition – forgetting or loss of language proficiency that can take place in one’s first or additional language, for different reasons, and at different life stages.Offering a comprehensive state-of-the-art overview, Michael T. Putnam and David Natvig define key concepts and the contemporary debates in the field, discussing a variety of structural/grammatical, societal, and psychological/c...