This meeting will be dedicated to the presentation and discussion of the latest progress and the remaining challenges with regard to the development of the multi-functional open source GIS simulation model for granular avalanches, debris flows, and cascading landslide processes (r.avaflow). We will particularly focus on the extension of r.avaflow with a three-phase flow model, on a new function enabling the simulation of moderate-velocity earth flows, and on the presentation and discussion of new case studies. Everybody interested in the field of mass flow simulation is cordially invited to the meeting.