القرار الهندسي و النمذجة الرياضية

This paper presents the problem of the decision-making in Civil Engineering according to the quality of the available data and the basic structure of the analysis process .Fuzzy Set Theory is the most used tool to handle problems of uncertainty in the data especially in the decision-making . The new approach is based on the classification of the criteria's according to the phases and risks .Applications in infrastructure projects like water supply city networks and constructions for feeding cables in industry plant are presented.