Contents -- Acknowledgments -- Introduction -- Part One: Following the Cognitive Tradition -- 1. Three Major Scientific Research Traditions -- 2. Behaviorism and Second Language Learning -- 3. The Cognitive Tradition and Second Language Acquisition -- 4. Information Processing Models -- 5. Communicative Competence Versus Interactional Competence -- Part Two: A Dialogical Approach to SLA -- 6. Fundamental Principles of Vygotsky's Sociocultural Theory -- 7. Bakhtin's Dialogized Heteroglossia -- 8. Vygotsky's Sociocultural Theory and Second Language Learning -- 9. Building a New Model of Second Language Acquisition -- Bibliography -- Index.