High-fiidelity, multi-physics Modeling and Simulation (M&S) tools are being developed and utilized for a variety of applications in nuclear science and technology, and show great promise in their abilities to reproduce observed phenomena for many applications. These M&S tools enable rigorous modeling of coupled behaviors that needs to be properly validated against experiments. The Multi physics Pellet Cladding Mechanical Interaction Validation (MPCMIV) benchmark is organised in this context by the Nuclear and INdustrial Engineering (NINE) company in co-ordination with Studsvik, under the guidance of the NEA Expert Group on Multi physics Experimental Data, Benchmarks and Validation (EGMPEBV). It is an international project that involves the partecipation of universities and organisations from all over the world.