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It is critical to have frequent interactions an important factor in web-based learning in order to achieve better performance. Because it is easier to interact within a smaller group, many web-based classes divide all students into several groups in order to raise the frequencies of interactions. Therefore, web-based learning combined with virtual team has become a new learning model. Based on the observations on a web-based class, it is found that the frequencies and contents of interactions among classmates and among group members are different. However, so far, none of researches have focused on such phenomena. This research tries to explore the relationships between the interactions within the class and interactions within the group, and how these interactions relate to web-based learning performance. The data of this research is collected from a web-based class of NSYSU (http://cu.nsysu.edu.tw). There are 8 groups in the class. Each student is allowed to post articles on Class Discuss Board as well as Group Discuss Board. First, based on content analysis research method, all articles are classified into several types. Then the relationships between interactions within class and interactions within groups are examined by statistical analysis. It results in ten important and interesting findings.

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