| Sumario: | In this paper, we present a synchronous text-based communication tool, referred to as Adaptive Communication Tool (ACT), which provides capabilities for adaptation and personalization. ACT supports both the free and the structured form of dialogue. The structured dialogue is implemented by two types of Scaffolding Sentence Templates (SST); i.e. sentence openers or communicative acts. The capability of adaptation is considered in the sense of making suggestions for the supported form of dialogue and SST type and providing the most meaningful and complete set of SST with respect to the learning outcomes addressed by the collaborative learning activity and the model of collaboration followed by the group members. Also, ACT enables learners to have control on the adaptation by selecting the form of dialogue and the SST type they prefer to use and enriching the provided SST set with their own ones in order to cover their communication needs. The results from the formative evaluation of the tool showed that (i) the proposed dialogue form, SST type and the provided set of SST cover students' communication needs, (ii) the capability of personalizing the communication by selecting the desired communication means as well as by enriching the provided SST set satisfied students, and (iii) students used adequately both types of SST resulting into on-task and coherent dialogues.
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