Abstract : Economic Intelligence is mainly an activity of decision-problem solving. This activity is carried out by the decision maker who must formulate exact description of the decision-problem in collaboration with the watcher who must locate, supervise, validate and emphasize the strategic information needed for solving the problem. In order to optimize the sharing of knowledge between the decision maker and the watcher, we tried to establish a bridge between two models: the model of the decision-maker and the model of the watcher's information search problem. These linked models can help to increase the precision of the representation of the various parameters of the problem and to allow a greater performance and an optimization of the resolution to the decision-problem.