Richard Towell works at the University of Salford.Roger Hawkins works at the University of Essex.

• AcknowledgementsIntroduction1. The Observable Phenomena of Second Language Acquisition2. Early Linguistic Approaches to Explaining the Observable Phenomena of Second Language Acquisition3. Sociolinguistic Approaches to Explaining the Observable Phenomena of Second Language Acquisition4. Cognitive Approaches to Explaining the Observable Phenomena of Second Language Acquisition5. The Approach to Second Language Acquisition Based on Universal Grammar6. Parametric Variation and Transfer in Second Language Acquisition7. Parametric Variation and Incompleteness in Second Language Acquisition8. Parametric Variation, Staged Development and Cross-learner Systematicity in Second Language Acquisition9. Parametric Variation, Variability and the Limits of the Explanatory Power of Universal Grammar in Second Language Acquisition10. Explanations of Variability11. Hypothesis Creation and Revision12. The Development of Language Processing13. Approaches to Learner Strategies14. Towards a Model of Second Language Acquisition

Richard Towell works at the University of Salford.Roger Hawkins works at the University of Essex.

• AcknowledgementsIntroduction1. The Observable Phenomena of Second Language Acquisition2. Early Linguistic Approaches to Explaining the Observable Phenomena of Second Language Acquisition3. Sociolinguistic Approaches to Explaining the Observable Phenomena of Second Language Acquisition4. Cognitive Approaches to Explaining the Observable Phenomena of Second Language Acquisition5. The Approach to Second Language Acquisition Based on Universal Grammar6. Parametric Variation and Transfer in Second Language Acquisition7. Parametric Variation and Incompleteness in Second Language Acquisition8. Parametric Variation, Staged Development and Cross-learner Systematicity in Second Language Acquisition9. Parametric Variation, Variability and the Limits of the Explanatory Power of Universal Grammar in Second Language Acquisition10. Explanations of Variability11. Hypothesis Creation and Revision12. The Development of Language Processing13. Approaches to Learner Strategies14. Towards a Model of Second Language Acquisition

Richard Towell works at the University of Salford.Roger Hawkins works at the University of Essex.

• AcknowledgementsIntroduction1. The Observable Phenomena of Second Language Acquisition2. Early Linguistic Approaches to Explaining the Observable Phenomena of Second Language Acquisition3. Sociolinguistic Approaches to Explaining the Observable Phenomena of Second Language Acquisition4. Cognitive Approaches to Explaining the Observable Phenomena of Second Language Acquisition5. The Approach to Second Language Acquisition Based on Universal Grammar6. Parametric Variation and Transfer in Second Language Acquisition7. Parametric Variation and Incompleteness in Second Language Acquisition8. Parametric Variation, Staged Development and Cross-learner Systematicity in Second Language Acquisition9. Parametric Variation, Variability and the Limits of the Explanatory Power of Universal Grammar in Second Language Acquisition10. Explanations of Variability11. Hypothesis Creation and Revision12. The Development of Language Processing13. Approaches to Learner Strategies14. Towards a Model of Second Language Acquisition