Abstract: In this article, we are interested in the tasks collaborative resolution in a distance collective learning context, and in the use of information technology to support this activity. A part of this article is devoted to the modeling of the activity of tasks collaborative resolution. Then, we suggest an approach for the automatic perception of the good quality of the users� contribution. This approach is mainly based on the design of an on-line tool of tasks resolution using the semi-structured resolution by acts of language. The environment should also allow the fast perception of the complete progress of the session of tasks resolution and thus facilitating comprehension of the solution suggested for learners.