Welcome to a mini-series of episodes on experiments that changed fire science. In the first episode, we cover the a prioiri and posteriori modelling task within the Dalmarnock Fire Experiments programme carried out by the BRE Centre for Fire Safety Engineering at the University of Edinburgh. The whole experimental programme was led by prof. Jose Torrero. In this episode, we focus on two modelling tasks within the programme, that lead to a major shift in how modern modelling tools are used in fire engineering.To learn more about the testing programme please visit the BRE Centre for Fire Safety Engineering and the proceedings of the FIRESEAT Symposium 2007 which covered the study in depth. Guillermo's blog article about blind vs open fire modelling can be found here. The major papers discussed within this episode are:Round-robin study of a priori modelling predictions of the Dalmarnock Fire Test OneModelling of the Growth Phase of Dalmarnock Fire Test OnePosteriori Modelling of Fire Test One