Abstract EN:

Ln order to satisfy the constraints on competiveness and globalisation, the industrial organisations became very complex. The engineering design process shifted from a sequential process to a concurrent engineering and integrated design. Additionally, products being designed had made more complex the design process because multiple technologies (mechanical, software. . . ) are used while designing. Ln such context, the requirement management and the requirement engineering became complex tasks to achieve during the design process. We showed that the problem is not addressed from the beginning of the design process but that there is coevolution between problem and solution. To answer this challenge on requirement engineering, we first addressed activities that support requirements expression and evolution ail over the design process. Four activities were chosen. The next step was to look for means used in industrial organisations to support these activities (we focussed on elicitation and formalisation activities). Finally we proposed two models. The first one, underline the complexity of deploying requirements ina design process, and the second one highlights the relations between four elements of the organisation and their impact on the requirements network formalisation.