Chapter 1 Introduction
1��1 Importance of Interlanguage Variation
1��2 Rationale for the Study
1��3 Interlanguage as a Complex Dynamic System
1��4 Objective and Significance of the Current Research
1��5 Organization of the Dissertation

Chapter 2 Literature Review
2��1 Research on Interlanguage Variation
2��1��1 Typology of lnterlanguage Variation
2��1��2 Theoretical Research on Interlanguage Variation
2��1��3 Empirical Research on Interlanguage Variation
2��1��4 Research on Chinese EFL Learners' Interlanguage Variation
2��2 Research on Influencing Factors of lnterlanguage Variation
2��2��1 Traditional Research on Relationships Between Individual Differences and L2 Learning
2��2��2 The Exploration of Influencing Factors from the DST Perspective
2��3 Summary

Chapter 3 Research Methodology
3��1 Research Questions
3��2 Participants
3��3 Research Design
3��4 Data Collection Methods
3��4��1 Compositions
3��4��2 Sociolinguistic Interviews
3��4��3 Emails
3��4��4 Language Experience Interviews
3��4��5 Stimulated Recalls
3��4��6 Other Resources
3��5 Data Analysis Methods
3��5��1 The Transcription of Oral Data
3��5��2 The Coding of Variation in L2 Development
3��5��3 The Coding of the Influencing Factors
3��6 The Role of the Researcher
3��7 Ethical Considerations
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Chapter 4 Individual Case Descriptions
Chapter 5 Cross-case Analysis and Discussion
Chapter 6 Conclusion

Bibliography
Appendix