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This paper proposes a function to restrict undesired utterance roles on CSCL, in order to accelerate better discussion. The authors found that CSCL discussion often falls into stagnated and distracted situation when continuing utterances have same utterance role. To avoid this situation, the proposing system monitors the utterance roles attached by learners, finds continuity of utterances with the same role, and prevents to use the target role for the next utterance upload. Result of controlled experiment shows that the proposing function works well, and learners tend to refer more preceding utterances.
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