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This study proposed the concepts, architecture, and kernel of a GroupNet system to construct a more flexible ubiquitous learning environment. GroupNet is aiming to support small-group face-to-face learning activities anywhere and anytime without sticking in traditional classroom settings and additional infrastructures. We have also implemented the application programming interface (API) for accessing the core functions supported by GroupNet Kernel such that developers can develop GroupNet applications with fewer efforts. A GroupNet application has been developed using the APIs for conducting an experiment on how to reduce groupthink phenomenon in collaborative learning setting using mobile devices to evaluate the usability of GroupNet Kernel and illustrate the effectiveness of GroupNet applications.