赵蓉，博士，上海外国语大学副教授，英语语言文学、教育学硕士生导师，第四届三级学术骨干、第六届二级学术骨干。研究方向为二语习得、外语学习环境研究。主要学术成果有CSSCI和EI期刊论文《基于TTF模型论英语数字化游戏教学的可行性研究》、《从二语习得视角分析语言学习游戏设计的关键因素》、《泛在学习环境下信患化大学英语口语课程建设》、“Sense of Community and Continuance Intention Towards Online Language Learning”、“Social Interaction and Continuance Intention Towards Online Language Learning”等，多次在EUROCFILL（荷兰2014）等国际著名学术会议上宣读学术论文。
目录
Introduction
1 Research Background
2 Statement of the Problem
3 Purpose of the Study
4 Conceptual Framework
5 Organization of the Dissertation
Chapter One Literature Review
Introduction
1.1 Online Language Learning
1.1.1 Online Education
1.1.2 Research Status of Online Language Learning
1.1.3 Foreign Language Learning
1.2 Benefits of Online Education
1.2.1 Organizational Framework of Online Learning Community
1.2.2 Sense of Community
1.3 Learners' Continuance Intention Toward Online Education
1.3.1 TAM
1.3.2 ECM
1.4 Interaction in Distance Education
1.4.1 Definition
1.4.2 Instructional Interaction
1.4.3 System Interactivity
1.5 Equivalence Theory
1.5.1 Online Interactions with Learners
1.5.2 Equivalence Theory
1.6 Interaction Hypothesis (IH)
1.6.1 VersionsoflH
1.6.2 Deficiencies of IH
1.7 Socio-cultural Theory
1.7.1 ZPD
1.7.2 Mediation
1.7.3 Language,as a Symbolic Tool for Mediation
1.8 Scaffolding
1.8.1 Metaphor and Definition
1.8.2 Features and Functions of Scaffolding
1.8.3 Design of Scaffolding in Online Education
Summary
Chapter Two Research Model and Hypotheses
Introduction
2.1 Interaction in Online Language Learning
2.1.1 Interactivity and Scaffolding
2.1.2 Scaffolding Sources Versus Preconditions
2.1.3 Scaffolding Features and Dimensions
2.1.4 Scaffolding Dimensions and Scaffolding Types
2.2 Online Interaction and Continuance Intention
2.2.1 TAM
2.2.2 ECM
2.2.3 Sense of Community
2.2.4 Interaction Construction
2.2.5 Second-Order Construct of Scaffolding
Summary
Chapter Three Methodology
Introduction
3.1 Survey Instrument
3.1.1 0perationalizing the Second-Order Construct of Scaffolding
3.1.2 Developing the Survey Instrument
3.2 Pilot Test
3.3 Participants and Procedure
3.4 Analysis and Results
3.4.1 The Measurement Model
3.4.2 Common Method Bias
3.4.3 Hypothesis Testing
Summary
Chapter Four Discussion
Introduction
4.1 Online Interaction Construction
4.1.1 Integral Constituents of Online Interaction
4.1.2 Construction of Scaffolding
4.2 Correlation Between Interaction and Continuance Intention
Summary
Chapter Five Contributions and Implications
Introduction
5.1 Theoretical Contributions
5.2 Practical Implications
Summary
Conclusion
1 Summary of Contributions
2 Limitations
3 Directions for Future Research
Bibliography
Appendix
Appendix A: List of Items by Construct
Appendix B: Measurement Instrument
Appendix C: Chinese Version of Measurement Instrument
Appendix D: Construct Reliabilities,AVE and Correlations
Appendix E: Item Loadings and Cross-Loadings
