I am Vasily Lutsyk from the Institute of Physical Materials Science of the Siberian Branch of the Russian Academy of Sciences (IPMS SB RAS) and Banzarov Buryat State University (BSU), Republic Buryatia (Baikal Siberia), Russia. It is a great honor for me to participate in this prestigious conference and to meet you in this exciting city. As we all know, the phase diagram is an important tool in materials science. Besides the thermodynamical assessment of the experimental phase diagrams, the assembled 3D and 4D models of T-x-y and T-x-y-z diagrams permit to validate the experimental data and to design the microstructure of the heterogeneous material, including the materials genome decoding. “Phase Diagram as a Tool of Materials Science”, http://ipms.bscnet.ru/labs/skkm.html, is focused on the following topics: concentration fields of different dimension with different microstructures, correction of phase diagrams graphics, multi-component systems polyhedron, 3- and 4-phase regions with reaction type changing, competition of crystals with different dispersion in invariant regrouping of masses, mathematical approximation of phase diagrams, assembling of phase diagrams computer models. Let me to express once more my appreciation and to welcome all of you to the 3rd Annual Conference on Materials Science and Engineering in Rome. Thank you Vasily Lutsyk IPMS SB RAS & BSU, Russia