List of Tables
List of Figures
Chapter One Introduction
1.1 Background of the Study
1.2 Rationale for the Study
1.4 Significance of the Study
1.5 Organization of the Book
Chapter Two Literature Review
2.1 Introduction
2.2 Definitions of Lexical Richness
2.3 Measures for Lexical Richness
2.4 Role of Vocabulary in L2 Writing
2.6 Lexical Richness in Writings by L1 and L2 Learners
2.7 Lexical Richness and L2 Writing Quality
2.8 Lexical Features of L2 Writing
2.9 Research Gaps and Research Questions
2.10 Chapter Summary
Chapter Three Methodology
3.1 Introduction
3.2 Special Considerations for Research Design
3.3 Participants
3.4 Source of Data
3.5 Pilot Study
3.6 Procedures for Data Collection
3.7 Building the DIY Corpora
3.8 Data Analysis
3.9 Chapter Summary
Chapter Four Results and Findings of the Cross-sectional
Study
4.1 Introduction
4.2 Features of Lexical Variation
4.3 Features of Lexical Density
4.4 Features of Lexical Sophistication
4.5 Features of Word Length
4.6 Features of Word Frequency Distribution
4.7 Relationship between Lexical Richness and
Overall Writing Performance
4.8 Chapter Summary
Chapter Five Results and Findings of the Longitudinal
Study
5.1 Introduction
5.2 Features of Lexical Variation
5.3 Features of Lexical Density
5.4 Features of Lexical Sophistication
5.5 Features of Word Length
5.6 Features of Word Frequency Distribution
5.7 Relationship between Lexical Richness and
Overall Writing Performance
5.8 Chapter Summary
Chapter Six Results and Findings across the Two Corpora
6.1 Introduction
6.2 Patterns and Discrepancies in Lexical Variation
6.3 Patterns and Discrepancies in Lexical Density
6.4 Patterns and Discrepancies in Lexical Sophistication
6.5 Patterns and Discrepancies in Word Length
6.6 Pattems and Discrepancies in Word Frequency Disl]'ibuUon
6.7 Patterns and Discrepancies in the Relationships between
Lexical Richness and Overall Writing Performance
6.8 Chapter Summary
Chapter Seven Results and Findings of the Case Studies
7.1 Introduction
7.2 Results of KeynessAnalysis
7.3 Developmental Features of "we"
7.4 Developmental Features of "you"
7.5 Developmental Features of "I"
7.6 Developmental Features of "can"
7.7 Developmental Features of "know"
7.8 Developmental Features of "so"
7.9 Chapter Summary
Chapter Eight Discussion
8.1 Introduction
8.2 Overuse of High-frequency Words
8.3 Vocabulary Plateau Phenomenon in Lexical Variation
8.4 Models of Developmental Features of Lexical Richness
8.5 Unbalanced Effects of Lexical Richness on the Overall
Writing Performance
8.6 The Most Overused First and Second Personal Pronouns
8.7 The Most Overused Modal Auxiliary
8.8 The Most Overused Lexical Word
8.9 The Most Overused Multi-function Word
8.10 Chapter Summary
Chapter Nine Conclusion
9.1 Summary of the Study
9.2 Pedagogical Implications
9.3 Limitations of the Study
9.4 Suggestions for Future Studies
9.5 Concluding Remarks
References
Appendix I Prompts of Writing Task
Appendix H Marking Scheme for TEM-4 and
TEM-8 Compositions
Appendix III Stop List
Appendix IV UCREL CLAWS7 Tagset
Acknowledgements
