R. Bellamy, Designing Educational Technology: Computer-Mediated Change. In Context and Consciousness. Activity Theory and Human-Computer Interaction, pp.123-169, 1996.

S. Bødker, Through the Interface, 1991.

E. Christiansen, On Organizational Competence in System Development. An Activity Approach, Organizational Competence in Systems Development. A Scandinavian Contribution, pp.107-132, 1990.

Y. Engeström, Learning by Expanding. An Activity-theoretical approach to developmental research, Orienta- Konsultit Oy, 1987.

G. Fitzpatrick, S. Kaplan, and T. Mansfield, Physical spaces, virtual places and social worlds, Proceedings of the 1996 ACM conference on Computer supported cooperative work , CSCW '96, pp.334-377, 1996.
DOI : 10.1145/240080.240322

G. Fitzpatrick, W. Tolone, and S. Kaplan, Work, Locales and Distributed Social Worlds, Proceedings of the Fourth European Conference on Computer-Supported Cooperative Work (ECSCW'95), pp.1-16, 1995.
DOI : 10.1007/978-94-011-0349-7_1
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.42.475

A. Fjuk, Computer Support for Distributed Collaborative Learning Exploring a Complex Problem Area. Dr, 1998.

O. Hanseth, Information Technology as Infrastructure Ph, Gothenburg Studies in Informatics Report, vol.10, 1996.

L. Harasim, S. Hiltz, L. Teles, and M. Turoff, Learning Networks. A Field Guide to Teaching and Learning Online, 1995.
URL : https://hal.archives-ouvertes.fr/hal-00702947

B. Holmberg, Theory and Practice of Distance Education, 1995.

V. Kaptelinin, Activity Theory: Implications for Human Computer Interaction, Context and Consciousness. Activity Theory and Human-Computer Interaction. Nardi BA, pp.103-119, 1996.
DOI : 10.1007/978-3-642-85104-9_2

V. Kaptelinin, Computer-Mediated Activity: Functional Organs in Social and Developmental Contexts, Context and Consciousness. Activity Theory and Human-Computer Interaction. Nardi BA, pp.45-68, 1996.

K. Kuutti, Information Systems, cooperative work and active subjects: The activity-theoretical perspective Ph, 1994.

H. Kuzuoka, G. Ishimoda, Y. Nishimura, R. Suzuki, and K. Kondo, Can the GestureCam be a Surrugate, Proceedings of the Fourth European Conference on Computer-Supported Cooperative Work, pp.181-96, 1995.

B. Latour, Technology is Society Made Durable London, Routledge. Leontjev AN (1983) Virksomhed, bevidsthed, personlighed (In Danish), Forlaget Progress Seeing What We Build Together: Distributed Multimedia Learning Environments for Transformative Communications, CSCL: Theory and practice of an emerging paradigm, pp.171-186, 1991.

K. Schmidt, Modes and Mechanisms of Interaction in Cooperative Work, Risø-R-666(EN), 1994.

K. Schmidt and L. Bannon, Taking CSCW seriously, Computer Supported Cooperative Work (CSCW), vol.4, issue.3, pp.7-40, 1992.
DOI : 10.1007/BF00752449

A. Strauss, Continual Permutations of Actions, Aldine de Gruyter, 1993.

P. Sørgaard, A Discussion of Computer Supported Cooperative Work Ph, 1988.

L. Vygotsky, Mind in Society The Development of Higher Psychological Processes, 1978.