This minisymposium aims to collect/share contributions and experience from researchers and practitioners on trending topics of research and practice related to the flat dilatometer test (DMT) and the seismic dilatometer test (SDMT), with reference to technological developments, advancements in data interpretation and soil characterization, and recent design applications. The topics of the session incluse (but are not limited to): • Technological developments of equipment (automated Medusa DMT/SDMT) • Advancements in soil characterization and design applications by combined use of DMT & CPT (or other in-situ tests) • New interpretation methods • SDMT testing offshore/nearshore • DMT testing in intermediate soils • DMT testing in non-textbook soils (tropical, cemented, man-made deposits, tailings …) • DMT-based liquefaction assessment • Deformation analyses based on stiffness decay curves derived from SDMT • Case histories: DMT-based ground improvement control, settlement prediction, …