The French National Projects are research and development projects conducted at a national scale with the goal of developing emerging techniques in civil engineering for the benefice of the whole profession. They involve construction companies, design offices, public agencies and researchers. “Recommandations pour le calcul, l’exécution et le contrôle des soutènements par clouage des sols”, is the recommendation manual, published in 1991, at the end of the first National Project, named CLOUTERRE. This project aimed to develop the soil nailing techniques, to propose design rules and control processes. The soil nailing technique is a reinforced soil system, constructed during soil excavation. With this technique, excavation is realized for a first layer of reasonable height. Then nails are installed in order to improve soil stability. Finally, excavation surface is stabilized with a reinforced concrete structure before the next excavation phase. The complete excavation is then realized layer by layer down to the desired depth.