In this paper we analyze a real example of collaborative work in mechanical design. Two kind of problems emerge from this analysis: thefirst is a lack of complete design environment very early before modeling. The second is the need of a flexible and very intuilive collaboralive environment. In addition, there is no knowledge management of the exchanges, and the design method could be improved wirh information assistance during the project. From this analysis, we t y to detect design and collaborative tasks for which sru&nrs need help. Then a personal assistant agent is based on a task ontoloDJ is proposed to offee,. them this help.
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