Floating systems are needed when wind energy systems are located in water depths where fixed foundations are too expensive. A floating platform that is moored to the seabed with an operating wind turbine responds dynamically to the ocean environment and prediction of these motions are important for estimation of fatigue damage on vulnerable components. At the other end, the entire system needs to be designed to withstand extreme environments over its lifetime, all the while focusing on maximizing power production. This session will feature a cross-section of research that supports development and implementation of numerical techniques, with the aid of experimental validation.