N. Avouris, A. Dimitracopoulou, and V. Komis, On analysis of collaborative problem solving: an object-oriented approach, Computers in Human Behavior, vol.19, issue.2, pp.147-167, 2003.
DOI : 10.1016/S0747-5632(02)00056-0

N. Avouris, V. Komis, M. Margaritis, and G. Fiotakis, An environment for studying collaborative learning activities, Educational Technology & Society, vol.7, issue.2, pp.34-41, 2004.

G. Ayala and . Yano, A collaborative learning environment based on intelligent agents, Expert Systems with Applications, vol.14, issue.1-2, pp.129-137, 1998.
DOI : 10.1016/S0957-4174(97)00075-4

B. Barros and M. F. Verdejo, Analysing student interaction processes in order to improve collaboration. The DEGREE approach, International Journal of Artificial Intelligence in Education, vol.11, pp.221-241, 2000.

M. Blasco, J. Barrio, Y. Dimitriadis, C. Osuna, O. González et al., From cooperative learning to the virtual class. An experience in composition techniques, ultiBASE journal. Available, vol.online, 1999.

M. Burton, Computer modelling of dialogue roles in collaborative learning activities. Unpublished doctoral dissertation, 1998.

M. A. Constantino-gonzález, D. D. Suthers, and J. G. Escamilla-de-los-santos, Coaching webbased collaborative learning based on problem solution differences and participation, International Journal of Artificial Intelligence in Education, vol.13, pp.263-299, 2002.

P. Dillenbourg, Introduction; What do you mean by Collaborative Learning?, Collaborative Learning. Cognitive and Computational Approaches, pp.1-19, 1999.

P. Dillenbourg, Over-scripting CSCL: The risks of blending collaborative learning with instructional design, Three worlds of CSCL. Can we support CSCL, pp.61-91, 2002.
URL : https://hal.archives-ouvertes.fr/hal-00190230

P. Dillenbourg, M. Baker, A. Blaye, and C. Malley, The evolution of research on collaborative learning, Learning in Humans and Machines, 1995.
URL : https://hal.archives-ouvertes.fr/hal-00190626

A. Dimitracopoulou and V. Komis, Design principles for an open environment, supporting learning process participants on modelling and collaboration, Int. Journal of Continuing Engineering Education and Lifelong Learning, Special Issue on the Role of Information and Communication Technologies in Science Teaching and Learning, 2004.

W. Doise and G. Mugny, On the Social Development of the Intellect, 1984.
DOI : 10.1007/978-1-4684-4925-9_5

J. Donath, K. Karahalios, and F. Viégas, Visualizing conversation, Journal of Computer-Mediated Communication, vol.4, issue.4, 1999.
DOI : 10.1111/j.1083-6101.1999.tb00107.x

URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.137.6641

G. Fesakis, A. Petrou, and A. Dimitracopoulou, Collaboration Activity Function: An interaction analysis tool for Computer Supported Collaborative Learning activities, Proceedings of the 4th IEEE International Conference on Advanced Learning Technologies, pp.196-200, 2004.

F. Flores, M. Graves, B. Hartfield, and T. Winograd, Computer systems and the design of organizational interaction, ACM Transactions on Information Systems, vol.6, issue.2, pp.153-172, 1988.
DOI : 10.1145/45941.45943

K. Gassner, M. Jansen, A. Harrer, K. Herrmann, and U. Hoppe, Analysis methods for collaborative models and activities, Designing for Change in Networked Learning Environments: Proceedings of the International Conference on Computer Support for Collaborative Learning 2003, pp.369-377, 2003.

K. Gassner, Using Patterns to Reveal E-Mail Communication Structures, J. Mostow, & P. Tedesco Designing Computational Models of Collaborative Learning Interaction, pp.77-82, 2004.

M. A. Gerosa, G. Pimentel, M. Fuks, H. Lucena, and C. , Analyzing Discourse Structure to Coordinate Educational Forums, Proceedings of the 7th International Conference on Intelligent Tutoring Systems, ITS 2004, pp.262-272, 2004.
DOI : 10.1007/978-3-540-30139-4_25

B. Goodman, M. Geier, L. Haverty, F. Linton, and R. Mccready, A framework for asynchronous collaborative learning and problem solving, Proceedings of AIED'01, 10th International Conference on Artificial Intelligence in Education, pp.188-199, 2001.

C. Gutwin, G. Stark, and S. Greenberg, Support for workspace awareness in educational groupware, The first international conference on Computer support for collaborative learning, CSCL '95, pp.147-156, 1995.
DOI : 10.3115/222020.222126

E. Hutchins, How a Cockpit Remembers Its Speeds, Cognitive Science, vol.1, issue.3, pp.265-288, 1995.
DOI : 10.1207/s15516709cog1903_1

A. Inaba and T. Okamoto, Development of the intelligent discussion support system for collaborative learning, Proceedings of ED-TELECOM '96, pp.137-142, 1996.

P. Jermann, Computer Support for Interaction Regulation in Collaborative Problem-Solving, 2004.

P. Jermann, A. Soller, and A. Lesgold, Computer Software Support for CSCL, Computer-supported collaborative learning What we know about CSCL ... and implementing it in higher education, pp.141-166, 2004.
DOI : 10.1007/1-4020-7921-4_6

P. Jermann, A. Soller, and M. Muehlenbrock, From mirroring to guiding: A review of state of the art technology for supporting collaborative learning, Proceedings of the First European Conference on Computer-Supported Collaborative Learning, pp.324-331, 2001.
URL : https://hal.archives-ouvertes.fr/hal-00197377

D. Johnson, R. Johnson, and E. J. Holubec, Circles of learning: Cooperation in the classroom, 1990.

J. Kolodner and M. Guzdial, Effects with and of CSCL: Tracking learning in a new paradigm CSCL: Theory and Practice of an Emerging Paradigm, Mahwah NJ, pp.307-320, 1996.

F. Linton, B. Goodman, R. Gaimari, J. Zarrella, and H. Ross, Student Modeling for an Intelligent Agent in a Collaborative Learning Environment, Proceedings of the 9 th International Conference on User Modeling (UM '03), 2003.
DOI : 10.1007/3-540-44963-9_47

C. Looi, Supporting conversations and learning in online chat, Proceedings of AIED'01, 10th International Conference on Artificial Intelligence in Education, pp.142-153, 2001.

A. Martínez-monés, Y. Dimitriadis, B. Rubia-avi, E. Gómez-sánchez, and P. Fuente-redondo, Combining qualitative evaluation and social network analysis for the study of classroom social interactions, Computers & Education, vol.41, issue.4, pp.353-368, 2003.
DOI : 10.1016/j.compedu.2003.06.001

A. Martínez-monés, L. Guerrero, and C. Collazos, A model and a pattern for the collection of collaborative action in CSCL systems, Designing Computational Models of Collaborative Learning Interaction, pp.31-36, 2004.

M. Mcmanus and R. Aiken, Monitoring computer-based problem solving, Journal of Artificial Intelligence in Education, vol.6, issue.4, pp.307-336, 1995.

M. Muehlenbrock, Action-based Collaboration Analysis for Group Learning, 2001.

M. Muehlenbrock and U. Hoppe, Computer supported interaction analysis of group problem solving, Proceedings of the 1999 conference on Computer support for collaborative learning, CSCL '99, pp.398-405, 1999.
DOI : 10.3115/1150240.1150290

URL : https://hal.archives-ouvertes.fr/hal-00197412

D. Neale and J. Carroll, Multi-faceted evaluation for complex, distributed activities, Proceedings of the 1999 conference on Computer support for collaborative learning, CSCL '99, pp.425-433, 1999.
DOI : 10.3115/1150240.1150293

K. A. Nurmela, E. Lehtinen, and T. Palonen, Evaluating CSCL log files by social network analysis, Proceedings of the 1999 conference on Computer support for collaborative learning, CSCL '99, pp.434-444, 1999.
DOI : 10.3115/1150240.1150294

H. Ogata, K. Matsuura, and Y. Yano, Active Knowledge Awareness Map: Visualizing learners activities in a Web based CSCL environment, International Workshop on New Technologies in Collaborative Learning, 2000.

T. P. Padilha, L. M. Almeida, and J. B. Alves, Mining Techniques for Models of Collaborative Learning, Designing Computational Models of Collaborative Learning Interaction, pp.89-94, 2004.

C. Plaisant, A. Rose, G. Rubloff, R. Salter, and B. Shneiderman, The design of history mechanisms and their use in collaborative educational simulations, Proceedings of the 1999 conference on Computer support for collaborative learning, CSCL '99, pp.348-359, 1999.
DOI : 10.3115/1150240.1150284

L. Rabiner, A tutorial on Hidden Markov Models and selected applications in speech recognition, Proceedings of the IEEE, pp.257-286, 1989.

R. J. Robertson and W. T. Powers, Introduction to modern psychology: the control-theory view, Gravel Switch, 1990.

M. Rosatelli and J. Self, A Collaborative Case Study System for Distance Learning, International Journal of Artificial Intelligence in Education, vol.12, pp.1-25, 2002.
URL : https://hal.archives-ouvertes.fr/hal-00197307

M. Roseman and S. Greenberg, GROUPKIT, Proceedings of the 1992 ACM conference on Computer-supported cooperative work , CSCW '92, pp.43-50, 1992.
DOI : 10.1145/143457.143460

G. Salomon, Distributed cognitions. Psychological and educational considerations, 1993.

G. Salomon and D. N. Perkins, Individual and Social Aspects of Learning, Review of Research in Education, vol.23, pp.1-24, 1998.
DOI : 10.2307/1167286

G. Salomon, D. Perkins, and T. Globerson, Partners in Cognition: Extending Human Intelligence with Intelligent Technologies, Educational Researcher, vol.20, issue.3, pp.2-9, 1991.
DOI : 10.3102/0013189X020003002

S. Simoff, Monitoring and Evaluation in Collaborative Learning Environments, Proceedings of the Computer Support for Collaborative Learning (CSCL) 1999 Conference, 1999.

A. Soller, Computational Modeling and Analysis of Knowledge Sharing in Collaborative Distance Learning. User Modeling and User-Adapted Interaction: The Journal of Personalization Research, pp.351-381, 2004.

A. Soller and A. Lesgold, A Computational Approach to Analyzing Online Knowledge Sharing Interaction, Proceedings of Artificial Intelligence in Education, pp.253-260, 2003.

L. Talavera and E. Gaudioso, Mining Student Data to Characterize Similar Behaviour Groups in Unstructured Collaboration Spaces, Proceedings of the Artificial Intelligence in Computer Supported Collaborative Learning Workshop at the ECAI, 2004.

S. Teasley and J. Roschelle, Constructing a joint problem space, Computers as cognitive tools, pp.229-257, 1993.

P. Tedesco, MArCo: Building an Artificial Conflict Mediator to Support Group Planning Interactions, International Journal of Artificial Intelligence in Education, vol.13, pp.117-155, 2003.
URL : https://hal.archives-ouvertes.fr/hal-00197314

A. C. Vieira, L. Teixeira, A. Timóteo, P. Tedesco, and F. A. Barros, Analyzing On-Line Collaborative Dialogues: The OXEnTCH?????Chat, 2004.
DOI : 10.1007/978-3-540-30139-4_30

A. Vizcaíno, Negative situations in collaborative environments: Can a simulated student avoid them? Proceedings of AIED'01, 10th International Conference on Artificial Intelligence in Education, pp.610-612, 2001.

L. S. Vygotsky, Mind in society: The development of higher psychological processes, 1978.

S. Wasserman and K. Faust, Social Network Analysis: Methods and Applications, 1996.
DOI : 10.1017/CBO9780511815478

B. Wasson, F. Guribye, and A. Mørch, Project DoCTA: Design and use of collaborative telelearning artefacts, 2000.

N. Webb, Testing a theoretical model of student interaction and learning in small groups Interaction in Cooperative Groups: The Theoretical Anatomy of Group Learning, pp.102-119, 1992.

J. Zumbach, M. Mühlenbrock, M. Jansen, P. Reimann, and U. Hoppe, Multi-dimensional tracking in virtual learning teams, Proceedings of the Conference on Computer Support for Collaborative Learning Foundations for a CSCL Community, CSCL '02, pp.650-651, 2002.
DOI : 10.3115/1658616.1658768