Jung, Yang-soo. 2009. A Study on the Interaction Modes and Their Effects in Task-based English Learning Via CMC Contexts. English Language and Linguistics 27, 69-91. The purpose of this study is to examine what types of interaction patterns students used while they were conducting two different tasks in the CMC based language learning situation. Self-assessment method using 7-point Likert scale was employed to collect the data. To conduct task 1 requiring the individual efforts, students used socio-affective and cognitive interaction patterns more. On the other hand, to conduct task 2 requiring the cooperative efforts, students used cognitive and instructional interaction patterns more. But it was commonly found that students used meta-cognitive interaction patterns less compared to other 3 interaction patterns. The results of this study could provide the useful information to instructors who are designing the effective interactions in the CMC based language learning situations.