This paper (15 page PDF) aims "to provide researchers and educators with a replicable framework for a structured approach to evaluating the impact of chatbots on student learning." As the title suggests, the framework is based on measurements of learning gains, engagement and perceptions. The authors build a chatbot to evaluate the framework. It seems like a pretty standard approach (learning gains, for example, are evaluated with a pre-test and post-test). They suggest "the pedagogically designed GenAI chatbot can be an effective tool for enhancing student learning gains, engagement, and perception."
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