. Susan, Thus, here we can? Do you want to write?

. Susan, Thus, here it is about a natural group task?

B. Barron, Achieving Coordination in Collaborative Problem-Solving Groups, Journal of the Learning Sciences, vol.19, issue.4, pp.403-436, 2000.
DOI : 10.1037//0022-0663.87.3.406

K. Bielaczyc and A. Collins, Learning communities in classrooms: A reconceptualization of educational practice, Instructional design theories and models, pp.269-291, 1999.

F. C. Brodbeck, Synergy is not for free: Theoretische Modelle und experimentelle Untersuchungen über Leistungen und Leistungsveränderungen in aufgabenorientierten Kleingruppen [Synergy is not for free: Theoretical models and experimental studies on performance and performance changes in task-oriented small groups].Unpublished Habilitationsschrift (professoral dissertation), Förderung des kooperativen Lernens über Computernetze [Facilitation of cooperative learning via computer networks, 1999.

J. Bruhn, C. Gräsel, F. Fischer, and H. Mandl, Kategoriensystem zur Erfassung der Kokonstruktion von Wissen im Diskurs. [Coding scheme for the analysis of the coconstruction of knowledge in discourse]. Unpublished manuscript, 1998.

J. Buder, F. W. Hesse, and S. Schwan, A cognitive model of knowledge exchange in telematic learning groups, Proceedings of the 10th World Conference on Educational Multimedia and Hypermedia, pp.1588-1589, 1998.

J. A. Cannon-bowers and E. Salas, Team Performance and Training in Complex Environments, Current Directions in Psychological Science, vol.38, issue.3, pp.83-87, 1998.
DOI : 10.1111/1467-8721.ep10773005

H. H. Clark, Arenas of language use, 1992.

H. H. Clark and S. E. Brennan, Grounding in communication., 1991.
DOI : 10.1037/10096-006

E. G. Cohen, Restructuring the Classroom: Conditions for Productive Small Groups, Review of Educational Research, vol.64, issue.1, pp.1-35, 1994.
DOI : 10.3102/00346543064001001

A. Collins, J. S. Brown, and A. Holum, Cognitive apprenticeship: Making thinking visible, American Educator, vol.15, issue.3, pp.6-11, 1991.

N. J. Cooke, E. Salas, J. A. Cannon-bowers, and R. Stout, Measuring Team Knowledge, Human Factors: The Journal of the Human Factors and Ergonomics Society, vol.42, issue.1, pp.151-173, 2000.
DOI : 10.1518/001872000779656561

P. Dillenbourg, M. Baker, A. Blaye, and C. Malley, The evolution of research on collaborative learning, Learning in humans and machines: Towards an interdiciplinary learning science, pp.189-211, 1995.
URL : https://hal.archives-ouvertes.fr/hal-00190626

P. Dillenbourg and D. Traum, The role of the whiteboard in a distributed cognitive system. Paper presented at the Swiss Workshop on Distributed and Collaborative Systems, 1997.

K. E. Finn, A. J. Sellen, and . Wilbur, Video-mediated communication, 1997.

F. Fischer, Gemeinsame Wissenskonstruktion -theoretische und, 2002.

. Methodologische-aspekte, Collaborative knowledge construction -theoretical and methodological aspects], Psychologische Rundschau, vol.53, issue.3, pp.119-134

F. Fischer, J. Bruhn, C. Gräsel, and H. Mandl, Fostering collaborative knowledge construction with visualization tools, Learning and Instruction, vol.12, issue.2, pp.213-232, 2002.
DOI : 10.1016/S0959-4752(01)00005-6
URL : https://hal.archives-ouvertes.fr/hal-00190645

F. Fischer and H. Mandl, Being there or being where? Videoconferencing and cooperative learning Cognition in a digital world, pp.205-223, 2003.

S. R. Fussell and N. I. Benimoff, Social and Cognitive Processes in Interpersonal Communication: Implications for Advanced Telecommunications Technologies, Human Factors: The Journal of the Human Factors and Ergonomics Society, vol.37, issue.2, pp.228-250, 1995.
DOI : 10.1518/001872095779064546

B. Gabbert, D. W. Johnson, and R. T. Johnson, Cooperative Learning, Group-to-Individual Transfer, Process Gain, and the Acquisition of Cognitive Reasoning Strategies, The Journal of Psychology, vol.10, issue.8, pp.265-278, 1986.
DOI : 10.1080/00223980.1986.10545253

K. Gassner and H. U. Hoppe, Visuelle Sprachen als Grundlage kooperativer, 2000.

. Diskussionsprozesse, [Visual languages for collaborative discussion processes]

D. A. Hinsz, R. S. Tindale, and D. A. Vollrath, The emerging conceptualization of groups as information processors., Psychological Bulletin, vol.121, issue.1, pp.43-64, 1997.
DOI : 10.1037/0033-2909.121.1.43

K. Hogan, B. K. Nastasi, and M. Pressley, Discourse Patterns and Collaborative Scientific Reasoning in Peer and Teacher-Guided Discussions, Cognition and Instruction, vol.17, issue.4, pp.379-432, 2000.
DOI : 10.1037//0012-1649.32.1.102

W. Ickes and R. Gonzalez, Social" cognition and social cognition, What´s social about social cognition? Thousand Oaks, 1996.

H. Jeong and M. T. Chi, Constructing shared knowledge during collaboration and learning. Poster presented at the AERA Annual Meeting, 1999.

R. Klimoski and S. Mohammed, Team Mental Model: Construct or Metaphor?, Journal of Management, vol.10, issue.3, 1994.
DOI : 10.1177/014920639402000206

F. Lakin, Visual languages for cooperation: A performing medium approach to systems for cooperative work, Intellectual teamwork. Social and technological foundations of cooperative work, pp.453-488, 1990.

B. K. Nastasi and D. H. Clements, Social-cognitive behaviors and higher-order thinking in educational computer environments, Learning and Instruction, vol.2, issue.3, pp.215-238, 1992.
DOI : 10.1016/0959-4752(92)90010-J

A. Nicolopoulou and M. Cole, Generation and transmission of shared knowledge in the culture of collaborative learning: The Fifth Dimension, its play-world and its institutional contexts, Contexts for learning, pp.283-314, 1993.

J. L. Nye and . Brower, What´s social about social cognition? Thousand Oaks, 1996.

O. 'connaill, B. Whittaker, and S. , Characterizing, predicting, and measuring video-mediated communication: A conversational approach, Video-mediated communication, pp.107-132, 1997.

O. Donnell and A. , Effects of explicit incentives on scripted and unscripted cooperation., Journal of Educational Psychology, vol.88, issue.1, pp.74-86, 1996.
DOI : 10.1037/0022-0663.88.1.74

J. E. Orr, Sharing knowledge, celebrating identity: War stories and community memory among service technicians, Collective remembering: Memory in society, pp.169-181, 1990.

A. S. Palincsar and A. L. Brown, Reciprocal teaching of comprehensionfostering and monitoring activities, Cognition and Instruction, vol.1, pp.117-175, 1984.

R. Plötzner, E. Fehse, C. Kneser, and H. Spada, Learning to Relate Qualitative and Quantitative Problem Representations in a Model-Based Setting for Collaborative Problem Solving, Journal of the Learning Sciences, vol.2, issue.2, pp.177-214, 1999.
DOI : 10.1016/S0364-0213(99)80022-6

A. Renkl, H. Mandl, and H. Gruber, Inert knowledge: Analyses and remedies, Educational Psychologist, vol.2, issue.5, pp.115-122, 1996.
DOI : 10.1016/0959-4752(94)90002-7

L. B. Resnick, Shared cognition: Thinking as social practice., Perspectives on socially shared cognition, pp.1-20, 1991.
DOI : 10.1037/10096-018

B. Rogoff, Social interaction as apprenticeship in thinking: Guided participation in spatial planning., Perspectives on socially shared cognition, pp.349-364, 1991.
DOI : 10.1037/10096-015

J. Roschelle, Learning by Collaborating: Convergent Conceptual Change, Journal of the Learning Sciences, vol.1, issue.3, 1996.
DOI : 10.1146/annurev.an.19.100190.001435

. Koschmann, CSCL: Theory and practice of an emerging paradigm, pp.209-248

J. Roschelle and R. Pea, Trajectories from Today's WWW to a Powerful Educational Infrastructure, Educational Researcher, vol.28, issue.5, pp.22-25, 1999.
DOI : 10.2307/1176369

J. Roschelle and S. D. Teasley, The Construction of Shared Knowledge in Collaborative Problem Solving, Computer supported collaborative learning, pp.69-97, 1995.
DOI : 10.1007/978-3-642-85098-1_5

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, 1998.
DOI : 10.2307/1167286

K. Sassenberg, M. Boos, I. Laabs, and S. Wahring, Bedeutung des Wissens um eigene und fremde Expertise für das Information Sampling in computervermittelter Kommunikation [The role of knowledge on the expertise of oneself and of others in information sampling under conditions of computer, 1998.

M. Scardamalia and C. Bereiter, Computer support for knowledge-building communities CSCL: Theory and practice of an emerging paradigm, pp.249-268, 1996.

S. Schultz-hardt, M. Jochims, and D. Frey, Productive conflict in group decision making: Genuine and contrived dissent as strategies to counteract biased information seeking, Organizational Behavior & Human Decision Processes, pp.563-586, 2002.

A. J. Sellen, Speech patterns in video-mediated communications, Proceedings of the Conference on Computer Human Interaction (CHI), pp.49-59, 1992.

R. Slavin, Research on Cooperative Learning and Achievement: What We Know, What We Need to Know, Contemporary Educational Psychology, vol.21, issue.1, pp.43-69, 1996.
DOI : 10.1006/ceps.1996.0004

G. Stasser and D. Stewart, Discovery of hidden profiles by decision-making groups: Solving a problem versus making a judgment., Journal of Personality and Social Psychology, vol.63, issue.3, pp.426-434, 1992.
DOI : 10.1037/0022-3514.63.3.426

D. D. Suthers, Towards a Systematic Study of Representational Guidance for Collaborative Learning Discourse, Journal of Universal Computer Science, vol.7, issue.3, 2001.

D. D. Suthers and C. D. Hundhausen, Learning by constructing collaborative representations: An empirical comparison of three alternatives, 2001.

S. Teasley, Talking About Reasoning: How Important Is the Peer in Peer Collaboration?, 1997.
DOI : 10.1007/978-3-662-03362-3_16

J. Tudge, When collaboration leads to regression: Some negative consequences of socio-cognitive conflict, European Journal of Social Psychology, vol.20, issue.2, pp.123-138, 1989.
DOI : 10.1002/ejsp.2420190204

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

G. M. Wittenbaum and G. Stasser, Management of Information in Small Groups, 1996.
DOI : 10.4135/9781483327648.n1