Prediction of the areas threatened by landslides and gravity-driven mass flows are a key part of hazard assessment in mountainous regions. Whatever the material transported (debris, snow, etc.), the mass wasting process involves determining the initiation mechanisms, initial volume, physical transport, and probable entrainment processes and as well as deposition mechanisms. Because of the number of scientific disciplines needed to solve it, there is a substantial benefit from interdisciplinary research. This session aims to bring together new research results from a variety of different approaches to understanding mass movement processes. In particular, we encourage presentations on physical modelling, innovative laboratory research, theoretical studies on the physics of multiphase and multiscale phenomena and detailed field observations, which yield insight into the triggering mechanisms, the mass movement or mass flow process. Contributions related to the modelling of landslides and granular geophysical flows, including torrential sediment transport, debris flows, rock avalanches, and snow avalanches, and similar flows are expected.