| TITLE PAGE | 第1-4页 |
| ABSTRACT | 第4-7页 |
| 中文摘要 | 第7-9页 |
| ACKNOWLEDGEMENTS | 第9-12页 |
| LIST OF TABLES | 第12-13页 |
| LIST OF ABBRIEVATIONS | 第13-14页 |
| CHAPTER ONE INTRODUCTION | 第14-18页 |
| ·Research background and orientation | 第14-15页 |
| ·Rationale for the present study | 第15-16页 |
| ·Research questions | 第16页 |
| ·Overview on the following chapters | 第16-18页 |
| CHAPTER TWO LITERATURE REVIEW | 第18-44页 |
| ·Incidental Vocabulary Acquisition | 第18-20页 |
| ·Theoretical introduction | 第18-19页 |
| ·Empirical studies | 第19-20页 |
| ·Task-based Approaches to vocabulary acquisition | 第20-27页 |
| ·Task-Based Approaches —Theoretical Introduction | 第20-24页 |
| ·Empirical Research on Task-based Approaches | 第24-27页 |
| ·The Task-induced Involvement Load Hypothesis | 第27-36页 |
| ·Theoretical introduction: | 第28-31页 |
| ·Empirical studies | 第31-35页 |
| ·Summary | 第35-36页 |
| ·Psycho-cognitive process in vocabulary learning | 第36-40页 |
| ·A Constructivist view on learners and task | 第37-38页 |
| ·2. Attention in language learning | 第38-39页 |
| ·Learning stages of second language vocabulary in classroom | 第39-40页 |
| ·Task-induced Involvement Load Hypothesis reconsidered | 第40-44页 |
| CHAPTER THREE METHODOLOGY | 第44-50页 |
| ·The aim | 第45页 |
| ·Materials | 第45-48页 |
| ·Reading passage | 第45页 |
| ·Target words | 第45-46页 |
| ·Tasks | 第46-48页 |
| ·Hypotheses to be tested | 第48页 |
| ·Participants | 第48-49页 |
| ·The procedure | 第49-50页 |
| CHAPTER FOUR RESULTS AND DISCUSSION | 第50-68页 |
| ·Scoring and statistics | 第50页 |
| ·Results and analyses | 第50-62页 |
| ·Results for Hypothesis 1: the effect of tasks on word retention | 第50-51页 |
| ·Results for Hypothesis 2: the effect of involvement load on word retention | 第51-53页 |
| ·Results for Hypothesis 3: the effect of need on incidental vocabulary acquisition: | 第53-56页 |
| ·Tests for Hypothesis 4: The effect of evaluation on word retention | 第56-59页 |
| ·Results for Hypothesis 5: the relative effect of need and evaluation on word retention | 第59-62页 |
| ·The summary of the results of the study | 第62-63页 |
| ·Discussion and interpretation of the results | 第63-68页 |
| CHAPTER FIVE CONCLUSIONS AND IMPLICATIONS | 第68-72页 |
| ·Significant findings of the study | 第68-69页 |
| ·Implications of the research results | 第69-70页 |
| ·Limitations and suggestions for further studies | 第70-72页 |
| BIBLIOGRAPHY | 第72-77页 |
| APPENDICES | 第77-83页 |
