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 implementation of a three-phase flow model, on the development of strategies facilitating predictive simulations, 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.