The session aims to discuss the different competing models on the mechanisms governing plate motion. How mantle convection correlates to surface plate kinematics? What is the real effect of slab pull? Is the Earth' tidal despinning contributing to the system? What is the real value of the net rotation of the lithosphere? Which is the best reference frame for studying plate motion? What happens at the lithosphere-asthenosphere decoupling? New researches highlighting specific areas of the Earth on any plate boundary, kinematic or tomographic studies, and models which may contribute to the understanding of the potential mechanisms are welcome.