| Acknowledgements | 第1-4页 |
| Abstract | 第4-6页 |
| 摘要 | 第6-10页 |
| List of Tables | 第10-11页 |
| List of Abbreviations | 第11-12页 |
| Chapter 1 Introduction | 第12-16页 |
| ·General description of the study | 第12页 |
| ·Motivation for the study | 第12-13页 |
| ·Significance of the study | 第13-14页 |
| ·Feasibility of the study | 第14-15页 |
| ·Overall structure of the thesis | 第15-16页 |
| Chapter 2 Literature Review | 第16-35页 |
| ·Discussion of the key terms in this study | 第16-21页 |
| ·Difficulty and item difficulty | 第16-19页 |
| ·Error Correction | 第19-20页 |
| ·CET-6 | 第20页 |
| ·TEM-8 | 第20-21页 |
| ·Validity | 第21页 |
| ·Reliability | 第21页 |
| ·Related theories | 第21-27页 |
| ·Language testing | 第22-23页 |
| ·Item analysis | 第23页 |
| ·Validity, reliability and difficulty | 第23-24页 |
| ·Error Analysis | 第24-27页 |
| ·Related empirical studies | 第27-34页 |
| ·Previous research on CET-4, CET-6, TEM-4 and TEM-8 | 第27-29页 |
| ·Previous research on Error Correction | 第29-32页 |
| ·Previous research on difficulty | 第32-34页 |
| ·Specification of research objectives | 第34-35页 |
| Chapter 3 Methodology | 第35-42页 |
| ·Research objectives | 第35页 |
| ·Research designs | 第35-42页 |
| ·Major design | 第35-40页 |
| ·Minor design | 第40-42页 |
| Chapter 4 Results and Discussion | 第42-54页 |
| ·Overall difficulty of the ECs in CET-6 and TEM-8 | 第42-43页 |
| ·Overall difficulty of the ECs in CET-6 | 第42-43页 |
| ·Overall difficulty of the ECs in TEM-8 | 第43页 |
| ·Comparisons of the ECs in CET-6 and TEM-8 | 第43-53页 |
| ·Overall comparison of the difficulty of the ECs in CET-6 and TEM-8 | 第43-45页 |
| ·Specific comparison of the ECs in CET-6 and TEM-8 in terms of vocabulary, sentence length, ECI type and the proportion of EDI | 第45-53页 |
| ·Summary | 第53-54页 |
| Chapter 5 Conclusion | 第54-57页 |
| ·Major findings | 第54页 |
| ·Implications | 第54-55页 |
| ·Limitations of this study | 第55页 |
| ·Suggestions recommended for future research | 第55-57页 |
| References | 第57-61页 |
| Appendix | 第61-67页 |
