What should language and writing teachers do about giving students written corrective feedback? This book surveys theory, research, and practice on the important and sometimes controversial issue of written corrective feedback, also known as error/grammar correction, and its impact on second language acquisition and second language writing development. Offering state-of-the-art treatment of a topic that is highly relevant to both researchers and practitioners, it critically analyzes and synthesizes several parallel and complementary strands of research - work on error/feedback (both oral and written) in SLA and studies of the impact of error correction in writing/composition courses - and addresses practical applications. Drawing from both second language acquisition and writing/composition literature, this volume is the first to intentionally connect these two separate but important lines of inquiry.