Designing, constructing and rehabilitating buildings, infrastructures and works of art essential to human activities are the missions of the civil engineer. When placing an order, the first task of the civil engineer is to carry out the complete study of the preliminary design. It considers all the consequences of the planned construction on the environment, the habitat, the economy of the territory concerned. An analysis on the ground allows him to make the topographic and geological surveys which will determine the feasibility of the project as well as the most suitable methods and materials to carry it out while ensuring the safety of the populations and the sustainability of the building. The Civil Engineer is then responsible for calculations and simulations, the invitation to tender and the selection of subcontractors. He examines the plans and modifies them if necessary. It is he who supervises the realization of the works from their beginning to their completion. He ensures compliance with standards and regulations, paying particular attention to the safety of workers and the public. He also ensures that the progress of the work corresponds to the deadlines and writes the reports intended for the contracting authority. The role of the civil engineer extends to maintenance and repair operations of existing structures.