團隊任務合作的執行效率在即時通訊系統的普及運用下有望更進一步，它可以鍵結相隔千里的人成組，讓他們能藉此進行問題討論，甚至使跨語言腦力激盪變得可能。但是，跨語言團隊裡，成員彼此可能受限於個人語言能力而產生跨語言溝通的障礙，腦力激盪時，成員間的互動性則可能影響團隊產出在質或量上的差異，如何在成員之間的溝通效率和團體產出表現之間取得平衡創造了一個系統設計的空間。在這篇論文裡，筆者實做了一個腦力激盪輔助工具－NBrain，並藉以探討行為頻道如何影響人在跨語言腦力激盪時的行為。NBrain具備發送使用者當前工作狀態、快速向其他使用者提供回饋以及向其他使用者要求語言協助等功能。筆者透過場域內的實際部署以及實驗室內的使用者研究評測NBrain的使用性和它帶來的影響，結果顯示，筆者所設計的這些功能可在不加強使用者心裡負荷的情況下改善受測者在跨語言腦力激盪的表現。正向回饋－like的多種樣貌不僅為腦力激盪帶來了多層面的影響，它的影響效力甚至可以延續至之後的統整階段。

The pervasive use of instant messaging system is prominent to reinforce the performance of group problem solving, as it could connect people from different places to do brainstorming altogether, making cross-lingual brainstorming possible. However, the interplay of cultural diversity in a group and the social interaction in brainstorming process raise the problem of cross-lingual communication and the tradeoff between quality and productivity of brainstorming output. In this work, a system prototype, NBrain, was implemented to study how behavioral and social signals influenced cross-lingual brainstorming. NBrain was equipped with features that could transmit work status, provide appropriate feedback or signal social support in comprehension.  The usability and the impact of NBrain was evaluated in a field study and a user study in laboratories. The results of user study showed a positive trend of improved performance without enhancing their workload. The versatile usage of giving like influenced the collaborative performance of brainstorming in various ways, and its effect could last until summarization.

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