R. T. Johnson and D. W. Johnson, Action research: Cooperative learning in the science classroom, Science and Children, vol.24, pp.31-32, 1986.

S. Totten, T. Sills, A. Digby, and P. Russ, Cooperative learning: A guide to research, 1991.

R. Slavin, Cooperative learning: Theory, research and practice, 1990.

L. Lipponen, Exploring foundations for computer-supported collaborative learning, Proceedings of the Conference on Computer Support for Collaborative Learning Foundations for a CSCL Community, CSCL '02, pp.72-81, 2002.
DOI : 10.3115/1658616.1658627

A. Talamo, M. B. Ligorio, and R. J. Simons, How do we innovate by researching Learning innovations mediated by ICT: A socio-economic perspective, pp.85-98, 2003.

H. Van-der-meijden, R. J. Simons, D. Jong, and F. , Computer-supported collaborative learning networks in primary and secondary education, 2000.

M. Scardamalia and C. Bereiter, Computer Support for Knowledge-Building Communities, Journal of the Learning Sciences, vol.1, issue.3, pp.265-283, 1994.
DOI : 10.1207/s15327809jls0303_3

M. B. Ligorio, Integrating communication formats: synchronous versus asynchronous and text-based versus visual, Computers & Education, vol.37, issue.2, pp.103-125, 2001.
DOI : 10.1016/S0360-1315(01)00039-2

G. Salomon, Novel constructivist learning environments and novel technologies: some issues to be concerned with, Learning and Instruction, vol.8, issue.1, pp.3-12, 1998.
DOI : 10.1016/S0959-4752(98)00007-3

R. Harrè and L. Van-langenhove, Varieties of Positioning, Journal for the Theory of Social Behaviour, vol.1, issue.1, pp.393-407, 1991.
DOI : 10.1111/j.1468-5914.1991.tb00203.x

A. Talamo and M. B. Ligorio, Strategic Identities in Cyberspace, CyberPsychology & Behavior, vol.4, issue.1, pp.109-122, 2001.
DOI : 10.1089/10949310151088479

H. J. Hermans, The Dialogical Self: Toward a Theory of Personal and Cultural Positioning, Culture & Psychology, vol.7, issue.3, pp.243-281, 2001.
DOI : 10.1177/1354067X0173001

M. B. Ligorio and M. Veermans, Perspectives and patterns in developing and implementing international web-based collaborative learning environments, Computers & Education, vol.45, issue.3, 2005.
DOI : 10.1016/j.compedu.2005.04.007

V. Krogh, G. Ichijo, K. Nonaka, and I. , Enabling knowledge creation, 2000.
DOI : 10.1093/acprof:oso/9780195126167.001.0001