| Abstract | 第1-7页 |
| Acknowledgements | 第7-8页 |
| List of Figures | 第8页 |
| List of Tables | 第8-9页 |
| List of Appendix | 第9页 |
| Abbreviations | 第9-14页 |
| Chapter Ⅰ Introduction | 第14-19页 |
| ·Research background | 第14-15页 |
| ·Rational for the present study | 第15-18页 |
| ·Educational context in China | 第15-16页 |
| ·The pedagogical assumptions of group work | 第16-18页 |
| ·Organization of the present study | 第18-19页 |
| Chapter Ⅱ Theoretical Basis of Task-related Research | 第19-41页 |
| ·Overview. | 第19页 |
| ·Input Hypothesis | 第19-21页 |
| ·Krashen's Input Hypothesis | 第19-21页 |
| ·Criticisms on Input Hypothesis | 第21页 |
| ·Interaction Hypothesis | 第21-30页 |
| ·The early version of Long's Interaction Hypothesis | 第21-24页 |
| ·The late version of Long's Interaction Hypothesis | 第24-25页 |
| ·Relationship between interaction, comprehension and SLA | 第25-30页 |
| ·Output Hypothesis | 第30-38页 |
| ·Swain's Output Hypothesis | 第30-32页 |
| ·Noticing and modification of output | 第32-33页 |
| ·Output and second language acquisition | 第33-38页 |
| ·An integrated model of the three hypotheses | 第38-39页 |
| ·Summary | 第39-41页 |
| Chapter Ⅲ Review of the Empirical Studies on Task Type and Group Interaction | 第41-60页 |
| ·Overview | 第41页 |
| ·Empirical studies on participation patterns of interaction | 第41-45页 |
| ·Teacher-led class interaction vs. group interaction | 第41-43页 |
| ·Interaction in dyad, triad and group of four | 第43-44页 |
| ·Arguments on group interaction | 第44-45页 |
| ·Oral task description and related empirical studies | 第45-57页 |
| ·Classification of task type | 第46-47页 |
| ·Empirical studies on effect of task type on pair interaction | 第47-57页 |
| ·Studies on one-way vs. two way tasks | 第48-49页 |
| ·Studies on required vs. optional information exchange tasks | 第49-52页 |
| ·Studies of tasks in a natural classroom context | 第52-56页 |
| ·Studies on task-based interaction and modified output | 第56-57页 |
| ·Summary | 第57-60页 |
| Chapter Ⅳ The Study | 第60-75页 |
| ·Overview | 第60页 |
| ·Research methodology | 第60-61页 |
| ·Research questions of the present study | 第61-62页 |
| ·The pilot study | 第62-63页 |
| ·Research design of the present study | 第63-73页 |
| ·Participants | 第63-64页 |
| ·The settings | 第64页 |
| ·Materials | 第64-67页 |
| ·Instrumentations | 第67-68页 |
| ·Data collection | 第68页 |
| ·Data transcription and coding | 第68-73页 |
| ·Measure of the language production | 第69-70页 |
| ·Coding of the negotiation moves | 第70-72页 |
| ·Measure of modified output | 第72-73页 |
| ·Summary | 第73-75页 |
| Chapter Ⅴ Results and Discussion | 第75-100页 |
| ·Overview | 第75页 |
| ·Results | 第75-89页 |
| ·Language production | 第75-81页 |
| ·The quantity of language production | 第75-77页 |
| ·The quality of the language production | 第77-81页 |
| ·Negotiation moves | 第81-84页 |
| ·Triggers | 第81-82页 |
| ·Modification of interaction | 第82-84页 |
| ·Modified output (MO) | 第84-87页 |
| ·Results of the questionnaire | 第87-89页 |
| ·Discussion | 第89-97页 |
| ·Language production | 第89-91页 |
| ·Discussion on the effect of the two task types on the quantity of language production | 第89-90页 |
| ·Discussion on the effect of the two task types on the quality of language production | 第90-91页 |
| ·Negotiation moves | 第91-95页 |
| ·Discussion of the effect of the two task types on negotiation moves | 第91-93页 |
| ·Discussion of the effect of the two designs within the same task type on negotiation moves | 第93-95页 |
| ·Modified output | 第95-97页 |
| ·Characteristics of pair interaction in Chinese EFL classroom | 第97-99页 |
| ·Summary | 第99-100页 |
| Chapter Ⅵ Conclusion | 第100-105页 |
| ·Overview | 第100页 |
| ·Summary of the major findings | 第100-101页 |
| ·Implication for Chinese English teachers | 第101-103页 |
| ·Limitations of the present study | 第103-104页 |
| ·Suggestions for further research | 第104-105页 |
| Bibliography | 第105-111页 |
| Appendix A: Communicative Tasks | 第111-113页 |
| Appendix B: Questionnaire | 第113-115页 |
| Appendix C: Transcription Conventions | 第115页 |
