MentorChat is a cloud-based multimodal dialogue system that utilizes an embodied conversational agent to scaffold learners’ discussions. We have developed MentorChat as a do-main-independent dialogue system that (a) promotes constructive peer interactions using facilitative agent interventions (prompts), and (b) enables the teacher to configure the support provided by the conversational agent.

MentorChat can support discussions in English or Greek, and was implemented using modern web technologies, such as HTML5, CSS3 and AJAX. The system infrastructure is based on a client-server model, which allocates workloads between the server and the clients. Its architecture comprises three main modules: the student, the teacher and the conversational agent module.


The conversational agent of MentorChat is based upon the following three models:

  • The peer interaction model, which records and stores the students’ interactions in a computational format.
  • The domain model, which utilizes the teacher’s domain knowledge representation in conjunction with the pattern matching algorithms to determine whether an agent intervention would be appropriate.
  • The intervention model, which examines a series of various micro-parameters (e.g. the time passed since the last agent intervention) to determine if an intervention will eventually be displayed.



Related Publications

  • S. TegosS. Demetriadis and A. Karakostas. "Promoting academically productive talk with conversational agent interventions in collaborative learning settings", Computers & Education, Vol. 87. 2015, pp. 309-3025.[More] 
  • S. TegosS. Demetriadis and T. Tsiatsos. "A Configurable Conversational Agent to Trigger Students’ Productive Dialogue: A Pilot Study in the CALL Domain", International Journal of Artificial Intelligence in Education, Vol. 24. 2014, pp. 309-325.[More]
  • S. TegosA. Karakostas and S. Demetriadis. "Conversational Agents for Learning: How the Agent Role Affects Student Talk". C. Karagianidis and P. P. Karasavvidis eds. 2014. [More] 
  • S. TegosS. Demetriadis and A. Karakostas. "Conversational Agent to Promote Students' Productive Talk: The Effect of Solicited vs. Unsolicited Agent Intervention". IEEE 14th International Conference on Advanced Learning Technologies. 2014. [More] 
  • S. Tegos, M. Kioumousidou, M. Vavami, D. Gkoumas, D. Kioutsouki and T. Tsiatsos. "HistoryLand: a Serious Game for History Learning in Primary Education". 8th European Conference on Games Based Learning (ECGBL-2014). 2014. [More] 
  • S. TegosS. Demetriadis and T. Tsiatsos. "Using a Conversational Agent for Promoting Collaborative Language Learning".Proceedings of 4th International Conference on Intelligent Networking and Collaborative Systems (INCoS-2012), Bucharest, Romania. 2012. pp. 162-165. [More] 
  • S. Tegos and S. Demetriadis. "Designing a Teacher Customizable Conversational Agent to Trigger Online Students’ Interaction". Proceedings of Workshop on Intelligent Support for Learning in Groups, 11th International Conference on Intelligent Tutoring Systems (ITS 2012), Chania, Greece. 2012. pp. 11-18. [More] 
  • S. TegosS. Demetriadis and A. Karakostas. "Exploring the Impact of a Conversational Agent When Triggering Students’ Discourse in Online Collaboration". Proceedings of IEEE 12th International Conference on Advanced Learning Technologies, Rome, Italy. 2012. pp. 321-323. [More] 
  • S. TegosS. Demetriadis and A. Karakostas. "MentorChat: Introducing a Configurable Conversational Agent as a Tool for Adaptive Online Collaboration Support". Proceedings of 15th Panhellenic Conference on Informatics (PCI 2011), Kastoria, Greece. 2011. pp. 13-17. [More] 
  • A. MavridisT. Tsiatsos and S. Tegos. "Exploiting Web Conferencing to Support Collaborative Learning". Proceedings of 15th Panhellenic Conference on Informatics (PCI 2011), Kastoria, Greece. 2011. [More] 
  • S. Tegos and S. Demetriadis. "Using a Conversational Agent for Promoting Collaborative Language Learning". 6th International Conference on Intelligent Networking and Collaborative Systems (INCoS-2014)[More] 



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