This session will present recent advances on structural aspects of glasses and melts at the short- and medium-range order, including heterogeneities. Any contribution that covers basic glass characterization and correlation between the glass and melt structure and glass properties is welcome. Further, especially welcome are contributions including, but not limited to, various experimental techniques, such as magnetic resonance spectroscopy; X-ray, neutron, and light scattering; X-ray absorption and emission spectroscopy; vibrational spectroscopy; and scanning probe and electron microscopies.