Work has been done in developing a Revit add-in that is capable of using .ifc files for two-way communications between evacuation models and Revit. This means that .ifc files can be used to generate inputs for evacuation models (i.e. not only geometry, but also other variables related to occupant profiles, occupant loads, etc.) and then used to import evacuation model results back into Revit. We have been working on this using Pathfinder as the model for the proof of concept of this new workflow, in collaboration with Thunderhead Engineering developers.