The presentation, titled "Correlation Between Calculations and Tests: A Key Element in the V&V Process of Simulation," was delivered by Jean-Max Sanchez from Naval Group. It highlighted the crucial role of simulation credibility in naval defense and the importance of correlating simulations with actual tests throughout the lifecycle of naval vessels. Naval Group, an international player in naval defense, is involved in the entire life cycle of surface ships and submarines. The company operates globally, with customer navies in various countries and multiple sites across France specializing in different aspects of naval engineering and services. The presentation emphasized the significance of numerical simulations in various stages, including design studies, performance evaluations, construction support, and operational maintenance. Simulations play a critical role in various sectors like structural integrity, military performance, and nuclear safety. The process of Verification and Validation (V&V) is integral to ensuring the credibility of these simulations. Jean-Max Sanchez discussed specific cases where simulation and test correlations are vital. One example was the plastic buckling and ruin of submarine hulls, where simulations have significantly reduced the need for model testing. The presentation detailed the correlation strategy, which involves correlating components or simple sub-assemblies before combining them for further correlations. Other examples included the characterization of the rear kinematic chain of torpedoes and the assessment of anechoic tiles used for stealth and discretion on submarines. These examples illustrated the complex nature of correlation processes and the necessity of close interaction between measurement and simulation personnel. The presentation concluded by reinforcing the impact of numerical simulation across various fields within Naval Group, such as structural integrity, acoustic discretion, and submarine explosion resilience. The correlations between simulations and real-world tests not only enhance confidence in the simulations but are also critical for complex systems. This process, though often intricate, is essential for the credibility of simulations in naval defense applications.