Appropiation, the special kind of learning that concerns cultural objects, takes sign-mediated assistance from other members of the culture, who scaffold children’s first attempt with the cultural object in such a way that they gradually move from being able to use tools underguidance to being able to use them on their own way (Leontjev, 1981; Tolmanm, 1988).

This definition was taken from: Baker, M., Hansen, T., Joiner, R., and Traum, D. (1999). Collaborative Learning: Cognitive and Computational Approaches, chapter The role of grounding in collaborative learning tasks, pages 31–63. Pergamon / Elsevier Science, Amsterdam. Available from: http://gric.univ-lyon2.fr/gric5/home/mbaker/webpublications/GG-99.PDF.