The third GMA workshop took place on the 28th and 29th March 2015 at the ETHH in Zurich, Switzerland. The purpose of the workshop was to integrate GMA into the overarching methodology by using it as a modelling framework for the rail network case study, in order to identify the scenarios to be investigated in the risk assessment, and to isolate those events which are deemed to be most important and treated in more depth. The workshop was attended by the facilitator, RCAB, representatives from the relevant work packages and from the chairman of the advisory board and PSJ who provided input and insight to the workshop from a stakeholders point of view.